أهم ٦٠٠ كلمة للستيب PDF
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هذا الكتيب يُقدم أهم ٦٠٠ كلمة في اختبار الستيب، مفصولةً بمستويات الصعوبة، مع أمثلة لكل كلمة. يُقدم الكتيب طريقةً سهلةً لحفظ الكلمات.
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٦٠٠ اﻟﻘﺼﺔ ورا ﻫﺬا اﻟﻜﺘﻴﺐ.. ﻋﺸﺎن ﺗﺴﺘﻌﺪ ﺑﻘﻮة ﻻﺧﺘﺒﺎرك ﻣﻬﻢ ﺗﻜﻮن ﻋﺎرف أﻫﻢ ٦٠٠ﻛﻠﻤﺔ ﺗﺘﻜﺮر ﻓﻲ ا ﺧﺘﺒﺎ ر ا ﻟﺴ ﺘﻴﺐ ،ﻫ ﺬي ا ﻟﻜﻠﻤﺎ ت ا ﺳﺘﺨ ﻠﺼﺘﻬﺎ ﺑﻌﺪ درا ﺳﺔ أ ﻧﻤﺎ ط اﺧﺘﺒﺎر اﻟﺴﺘﻴﺐ ﺑﻌﻤﻖ وﺗﺤﻠﻴﻞ ﻧﺼﻮص ﻛﺜﻴﺮ ﺗﺘﻀﻤﻦ اﻛﺘﺮ ﻣﻦ ١٥أﻟﻒ...
٦٠٠ اﻟﻘﺼﺔ ورا ﻫﺬا اﻟﻜﺘﻴﺐ.. ﻋﺸﺎن ﺗﺴﺘﻌﺪ ﺑﻘﻮة ﻻﺧﺘﺒﺎرك ﻣﻬﻢ ﺗﻜﻮن ﻋﺎرف أﻫﻢ ٦٠٠ﻛﻠﻤﺔ ﺗﺘﻜﺮر ﻓﻲ ا ﺧﺘﺒﺎ ر ا ﻟﺴ ﺘﻴﺐ ،ﻫ ﺬي ا ﻟﻜﻠﻤﺎ ت ا ﺳﺘﺨ ﻠﺼﺘﻬﺎ ﺑﻌﺪ درا ﺳﺔ أ ﻧﻤﺎ ط اﺧﺘﺒﺎر اﻟﺴﺘﻴﺐ ﺑﻌﻤﻖ وﺗﺤﻠﻴﻞ ﻧﺼﻮص ﻛﺜﻴﺮ ﺗﺘﻀﻤﻦ اﻛﺘﺮ ﻣﻦ ١٥أﻟﻒ ﻛﻠﻤﺔ . و ﻗ ﺴ ﻤ ﺘﻬﺎ ﻟ ﻴﻚ ﺑﺎ ﻟ ﻤ ﺴﺘﻮ ﻳﺎ ت ﻋﺸﺎ ن ﺗ ﻤ ﺸ ﻲ ﻓ ﻴﻬﺎ ﺑﺎ ﻟ ﺘﺮﺗ ﻴﺐ . 🐥ﺑ ﺴ ﻴ ﻂ 🦊ﻣ ﺘ ﻮ ﺳ ﻂ 🦁ﺻ ﻌ ﺐ واﻓﻀﻞ ﻃﺮﻳﻘﺔ ﺗﺤﻔﻆ ﺑﻴﻬﺎ اﻟﻜﻠﻤﺎت ﻫﻲ :ﺗﻜﻨﻴﻜﺔ ﺣﻔﻆ اﻟﻜﻠﻤﺎت وﻫﻲ ﻃ ﺮﻳﻘ ﺔ ﺗﺴﺎﻋﺪك ﺗﺜﺒﺖ اﻟﻜﻠﻤ ﺎت ﻋﻨﺪك وﺗﻘ ﺪر ﺗﺴﺘﺨﺪﻣﻬ ﺎ ﻟﻤ ﺎ ﺗﺤﺘﺎﺟﻬﺎ ﺑﺎﻻ ﺧﺘﺒﺎر 👇 🐥 اﻟﻤﺴﺘﻮى اﻟﺒﺴﻴﻂ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل have ﻳﻤﺘﻠﻚ I have two sisters. do ﻳﻔﻌﻞ I must do my homework. will ﺳﻮف She will arrive tonight. say ﻳﻘﻮل Please say your name. go ﻳﺬﻫﺐ We'll go hiking. can ﻳﺴﺘﻄﻴﻊ You can play tennis. know ﻳﻌﺮف I don't know him. get ﻳﺤﻀﺮ Let's get groceries. think ﻳﻔﻜﺮ Think again about it. make ﻳﺼﻨﻊ She makes great cookies. time وﻗﺖ Manage your time. see ﻳﺮى See the sunset. other آﺧﺮ Any other questions? good ﺟﻴﺪ Eat for good health. people اﻟﻨﺎس People are chatting in the park. year ﻋﺎم This year has been challenging. take ﻳﺄﺧﺬ Please take a seat. come ﻳﺄﺗﻲ Come to the party tonight. work ﻳﻌﻤﻞ I need to work on my project. use ﻳﺴﺘﺨﺪم Can I use your pen? only ﻓﻘﻂ I have only one cookie left. look ﻳﻨﻈﺮ Look at the beautiful sunset. want ﻳﺮﻳﺪ I want a cup of coffee. give ﻳﻌﻄﻲ Can you give me a hand? find ﻳﺠﺪ I hope you find your keys. 🐥 اﻟﻤﺴﺘﻮى اﻟﺒﺴﻴﻂ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل day ﻳﻮ م Today is a busy day. thing ﺷﻲء What is that thing on the table? need ﻳ ﺤﺘ ﺎ ج We need more time to finish. right ﺣﻖ He cares about human rights. many ﻋﺪﻳﺪ There are many books on the shelf. last ا ﻻ ﺧ ﻴﺮ We enjoyed our last vacation in Europe. child ﻃﻔﻞ The child is playing in the park. tell ﻳ ﺨﺒ ﺮ Can you tell me a story? down أﺳﻔﻞ She looked down the road. show ﻳﻌﺮض Please show me the way. life ا ﻟ ﺤﻴ ﺎ ة Life is full of surprises. man رﺟﻞ The man is reading a newspaper. change ﻳﻐﻴﺮ I want to change my hairstyle. place ﻣﻜﺎن Let's find a quiet place to study. feel ﻳﺸﻌﺮ I feel happy when it's sunny. problem ﻣﺸﻜﻠﺔ Solving a problem requires creativity. write ﻳﻜﺘﺐ Can you write a letter to your friend? same ﻧﻔﺲ We have the same taste in hobbies. lot ﻛ ﺜ ﻴﺮ There's a lot to explore in this city. great راﺋﻊ She did a great job on the project. leave ﻳﻐﺎدر Please don't leave without saying goodbye. part ﺟﺰء Being part of a team is rewarding. help ﻳﺴﺎﻋﺪ I offered to help with the heavy lifting. ask ﻳﺴﺄل Don't hesitate to ask for assistance. meet ﻳﻘﺎﺑﻞ Let's meet at the cafe for lunch. 🐥 اﻟﻤﺴﺘﻮى اﻟﺒﺴﻴﻂ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل start ﻳﺒﺪأ We should start the project early. talk ﻳﺘﻜﻠﻢ We need to talk about our plans. put ﻳﻀﻊ Put your shoes by the door. country ﺑ ﻠﺪ My dream is to visit every country. old ﻗﺪﻳﻢ The book is an old edition. school ﻣﺪرﺳﺔ I enjoy going to school every day. different ﻣ ﺨﺘ ﻠ ﻒ Our tastes are quite different. next ا ﻟ ﺘﺎ ﻟ ﻲ What's the next item on the agenda? end ﻧﻬ ﺎ ﻳﺔ Every story has an end. live ﻳﻌﻴﺶ I want to live near the ocean. world اﻟﻌﺎﻟﻢ The world is full of diverse cultures. week اﺳﺒﻮع I go for a jog three times a week. play ﻳﻠﻌﺐ Let's play a board game tonight. course دورة I'm taking a cooking course online. house ﻣﻨﺰل Our new house has a beautiful garden. group ﻣﺠﻤﻮﻋﺔ I belong to a photography group. woman اﻣﺮأة The woman in the red dress is my sister. book ﻛﺘﺎب I always carry a book in my bag. family ﻋﺎﺋﻠﺔ Family dinners are special to me. hear ﻳﺴﻤﻊ Did you hear the birds singing? question ﺳﺆال I have a question about the assignment. study ﻳﺬاﻛﺮ It's important to find a quiet place to study. begin ﻳﺒﺪأ Let's begin the meeting with introductions. important ﻣﻬﻢ Eating healthy is important for us. run ﻳﺠﺮي I run in the park every morning. 🐥 اﻟﻤﺴﺘﻮى اﻟﺒﺴﻴﻂ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل early ﻣﺒﻜﺮا I wake up early to watch the sunrise. hand ﻳﺪ Please wash your hands before dinner. money اﻟﻤﺎل Saving money is a good habit. name اﺳﻢ My name is mentioned in the credits. read ﻳﻘﺮأ I love to read novels before bed. friend ﺻﺪﻳﻖ A true friend is always there for you. month ﺷﻬﺮ My birthday is next month. business ﻋﻤﻞ Starting a business requires careful planning. pay ﻳﺪﻓﻊ I'll pay for lunch today. second ﺛﺎﻧﻴﺔ I'll be back in a second. love ﻳﺤﺐ Love makes life beautiful. job وﻇﻴﻔﺔ Finding the right job can be challenging. example ﻣﺜﺎل Can you give me an example of that concept? young ﺻﻐﻴﺮ اﻟﺴﻦ The young artist won an award. close ﻳﻐﻠﻖ Please close the door behind you. buy ﻳﺸﺘﺮي I need to buy groceries after work. understand ﻳﻔﻬﻢ Can you help me understand this concept? hour ﺳﺎ ﻋ ﺔ I spend an hour reading every evening. student ﻃ ﺎﻟﺐ She is a smart student. face وﺟﻪ I recognized her face from a photograph. room ﻏﺮﻓﺔ The room is very quiet. head رأس I have a headache from staring at the screen. car ﺳ ﻴ ﺎ رة My dream is to own a car. learn ﻳﺘﻌﻠﻢ I try to learn something new every day. person ﺷﺨ ﺺ He's the kindest person I know. 🐥 اﻟﻤﺴﺘﻮى اﻟﺒﺴﻴﻂ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل bad ﺳﻲء It's a bad idea. city ﻣﺪﻳﻨﺔ New York City is known for its skyscrapers. night ﻟﻴ ﻞ I love taking walks at night. present ﺣﺎ ﺿ ﺮ The present moment is important age ﻋﻤﺮ With age comes wisdom. speak ﻳﺘﺤﺪث I can speak English and French. train ﻳﺪرب He trains me every day. possible ﻣﻤﻜﻦ Anything is possible with hard work. parent وﻟﻲ اﻣﺮ He is a new parent hard ﺻ ﻌﺐ Learning a new language is hard. party ﺣﻔﻠﺔ The party was so fun! water ﻣﻴﺎه Drink plenty of water for good health. send ﻳﺮﺳﻞ I'll send you the details via email. watch ﻳﺸﺎﻫﺪ I like to watch movies on weekends. past ﻣﺎﺿﻲ Let's learn from the mistakes of the past. test اﺧﺘﺒﺎر Tomorrow is the final test of the semester. visit زﻳﺎرة We plan to visit our grandparents soon. mother أم My mother is an excellent cook. walk ﻳﻤﺸﻲ I enjoy taking a walk in the park. stay ﻳﺒﻘﻰ We decided to stay home this weekend. stop ﻳﻘﻒ Please stop at the red traffic light. light ﺿﻮء Turn on the light; it's getting dark. remember ﻳﺘﺬﻛﺮ I always remember my mother's advice. answer ﻳﺠﻴﺐ Can you answer this question for me? sit ﻳﺠﻠﺲ Let's sit in the shade for a moment. 🐥 اﻟﻤﺴﺘﻮى اﻟﺒﺴﻴﻂ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل letter ﺧﻄﺎب I received your letter. language ﻟﻐﺔ Learning a new language is useful. subject ﻣﺎدة Math is my favorite subject in school. class ﺻﻒ I have a class in the afternoon. town ﺑﻠﺪة We live in a small town. half ﻧﺼﻒ Wait for half an hour; I'll be back soon. minute دﻗﻴﻘﺔ I'll be ready in a minute. food ﻃ ﻌﺎ م I love trying different types of food. note ﻣﻠﺤﻮﻇﺔ Take a note of the important details. drive ﻳﻘﻮد I prefer to drive rather than take the bus. eye ﻋ ﻴﻦ She has beautiful blue eyes. music ﻣﻮﺳﻴﻘﻰ I can hear the music. game ﻟﻌﺒ ﺔ Let's play a board game together. body ﺟﺴ ﻢ Exercise is good for your body. wait ﻳﻨﺘﻈﺮ I'll wait for you at the entrance. easy ﺳﻬﻞ Cooking can be easy with the right recipe. black اﺳﻮد I like wearing black clothes. paper ورﻗﺔ I need a sheet of paper to write on. computer ﺣﺎﺳﻮب My computer is running slowly. film ﻓﻴﻠﻢ We watched a great film last night. morning ﺻ ﺒﺎح I enjoy a quiet morning routine. shop ﻣﺘﺠﺮ I'll go to the shop to buy some groceries. carry ﻳﺤﻤﻞ Can you help me carry these bags? choose ﻳﺨﺘﺎر It's difficult to choose a book. father أب My father is an excellent storyteller. 🐥 اﻟﻤﺴﺘﻮى اﻟﺒﺴﻴﻂ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل table ﻃﺎوﻟﺔ Please set the dishes on the dining table. die ﻳﻤﻮت Flowers will die if not watered regularly. girl ﺑﻨﺖ The girl in the blue dress is my sister. difficult ﺻ ﻌﺐ Learning a new language can be difficult. please ﻣﻦ ﻓﻀﻠﻚ Can you please pass me the salt? eat ﻳﺄﻛﻞ Can we eat out tonight? phone ﻫ ﺎﺗ ﻒ I bought a new phone. draw ﻳﺮﺳﻢ I like to draw flowers. white أﺑﻴﺾ The walls in my room are white. date ﺗﺎرﻳﺦ It’s an important date for her. door ﺑﺎب Close the door please. teacher ﻣﻌﻠﻢ Our math teacher is very patient. travel ﻳﺴﺎﻓﺮ I love to travel and explore new places. enjoy ﻳﺴﺘﻤﺘﻊ I always enjoy spending time with friends. nice ﻟﻄﻴﻒ She gave me a nice book. picture ﺻﻮرة I have a beautiful picture of the sunset. boy وﻟﺪ The boy with the red backpack is my cousin. happy ﺳﻌﻴ ﺪ She feels happy today. road ﻃﺮﻳﻖ The road is very long. wear ﻳﺮﺗﺪي I like to wear comfortable clothes. teach ﻳﺪرس The professor will teach AI next semester. address ﻋﻨﻮان Please provide your home address. listen ﻳﺴﺘﻤﻊ It's important to listen to others. wrong ﺧﻄﺄ That answer is wrong. foot ﻗﺪم I hurt my foot while hiking. 🐥 اﻟﻤﺴﺘﻮى اﻟﺒﺴﻴﻂ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل animal ﺣﻴﻮان He studies animal habitats. fine ﺟﻴ ﺪ The weather is fine for a picnic. street ﺷ ﺎ رع Children played in the street. sport رﻳﺎﺿﺔ Playing a sport is a great way to stay active. poor ﻓﻘﻴﺮ They help poor people. way ﻃﺮﻳﻘﺔ There's more than one way to solve a problem. over ﻓﻮق The plane flew over the mountains. mean ﻳﻌﻨﻲ What does this word mean? such ﻣﺜﻞ She has such a lovely smile. call ﻳﺘﺼﻞ I'll call you as soon as I reach home. company ﺷﺮﻛﺔ I work for a software company. try ﻳﺤﺎول Don't be afraid to try new things. own ﻣﻠﻚ Everyone should have their own space. point ﻧﻘﻄﺔ Can you clarify your main point? become ﻳﺼﺒﺢ I hope to become fluent in French. interest اﻫﺘﻤﺎم Reading is one of my main interests. include ﻳﺘﻀﻤﻦ The package will include a gift. report ﺗﻘﺮﻳﺮ He needs to submit a detailed report. case ﺣﺎ ﻟ ﺔ In this case, honesty is crucial. seem ﻳﺒﺪو She seems happy today. let ﻳﺴﻤﺢ Let me know if you need any help. keep ﻳﺤﻔﻆ It's important to keep a positive attitude. system ﻧﻈﺎم The computer system is efficient. set ﻳﻀﺒﻂ Let's set a time to meet tomorrow. follow ﻳﺘﺎﺑﻊ Always follow your dreams. 🦊 اﻟﻤﺴﺘﻮى اﻟﻤﺘﻮﺳﻂ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل turn ﻳﻨﻌﻄ ﻒ Turn left at the traffic signal. few ﻗﻠﻴﻞ Only a few people attended the event. bring ﻳﺤﻀﺮ Can you bring some snacks to the party? move ﻳﺘﺤﺮك I plan to move to a new city next year. fact ﺣ ﻘﻴﻘﺔ The fact is, hard work pays off. area ﻣﻨﻄﻘﺔ The park is a popular recreation area. provide ﻳﻤﺪ Can you provide more details about the project? large ﻛﺒﻴﺮ The elephant is a large animal. information ﻣ ﻌﻠ ﻮ ﻣ ﺔ The library is a great source of information. order ﻃﻠﺐ Please place an order for the supplies. government ﺣ ﻜﻮ ﻣ ﺔ The government is implementing new policies. issue ﻗﻀﻴﺔ Environmental conservation is a critical issue. market ﺳﻮق The farmers' market is open on weekends. build ﻳﺒﻨﻲ They plan to build a new school. hold ﻳﻌﻘﺪ The company will hold a conference next month. service ﺧﺪﻣﺔ The restaurant provides excellent customer service. believe ﻳﺆﻣﻦ I believe in the power of positive thinking. increase ﻳﺰداد The company plans to increase production. plan ﺧﻄﺔ Let's create a detailed plan for the event. result ﻧﺘﻴﺠﺔ Hard work often leads to a positive result. happen ﻳﺤﺪث Unexpected things can happen in life. offer ﻋﺮض The store has a special offer on electronics. program ﺑﺮﻧﺎﻣﺞ She is enrolled in a coding program. lead ﻳﻘﻮد Good communication can lead to understanding. thank ﻳﺸﻜﺮ I want to thank you for your help. 🦊 اﻟﻤﺴﺘﻮى اﻟﻤﺘﻮﺳﻂ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل hope ﻳﺘﻤﻨﻰ I hope for a peaceful world. idea ﻓ ﻜﺮة Do you have an idea for the project? cost ﻳﻜﻠ ﻒ The cost of living in the city is high. less أﻗﻞ Sometimes less is more in design. reason ﺳﺒﺐ There's always a reason behind every decision. form ﺷﻜﻞ Swimming is a form of sport. spend ﻳﻘﻀﻲ I like to spend my weekends outdoors. level ﻣﺴﺘﻮى She reached a high level of proficiency. experience ﺧ ﺒﺮة Traveling is a great way to gain experience. member ﻋﻀﻮ He is a valued member of our team. able ﻗﺎدر With hard work, you'll be able to achieve your goals. support دﻋﻢ Friends and family often provide emotional support. line ﺧﻂ Stand in line for your turn. side ﺟ ﺎﻧﺐ I prefer sitting on the sunny side of the room. sure ﻣﺘﺄﻛﺪ Are you sure you want to proceed? term ﻓﺼﻞ ﻣﺪر ﺳﻲ The school term lasts for 12 weeks. least اﻻﻗﻞ Choose the option that involves the least risk. public ﻋﺎم Public transportation is convenient in the city. view ﻣﻨﻈﺮ The mountain offers a breathtaking view. consider ﻳﻌﺘﺒﺮ Before deciding, consider all options. price ﺳﻌﺮ The price of the item is reasonable. local ﻣﺤﻠﻲ Support local businesses in your community. control ﻳﺘﺤﻜﻢ You have control over your own actions. product ﻣﻨﺘﺞ This new product is innovative. lose ﻳﺨﺴﺮ Don't be afraid to lose; it's part of learning. 🦊 اﻟﻤﺴﺘﻮى اﻟﻤﺘﻮﺳﻂ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل story ﻗﺼﺔ The book tells an inspiring story. continue ﻳﺴﺘﻤﺮ Let's continue working on the project. stand ﻳﻘﻒ Please stand for the national anthem. whole ﻛﺎﻣﻞ Cut the apple into whole slices. care ر ﻋﺎﻳﺔ Take care of your health and well-being. expect ﻳﺘﻮﻗﻊ I expect you to be on time for the meeting. effect ﺗﺄﺛﻴﺮ The new policy had a positive effect on productivity. sort ﻧﻮع Please organize the files by sort code. fall ﻳﺴﻘﻂ The leaves fall from the trees in autumn. allow ﻳﺴﻤﺢ The school rules do not allow pets on campus. base ﻗﺎﻋﺪة The decision was based on careful analysis. suggest ﻳﻘﺘﺮح I suggest trying the new restaurant downtown. power ﻗﻮة Solar panels harness the power of the sun. grow ﻳﻨﻤﻮ Plants need sunlight and water to grow. return ﻳﻌﻮد After a long journey, they will return home tomorrow. matter اﻣﺮ This matter should go no further. mind ﻳﻤﺎﻧﻊ Do you mind if I open the window? value ﻗﻴﻤﺔ Family is of great value to me. office ﻣ ﻜﺘﺐ I have a meeting in the office at 2 PM. record ﺳﺠﻞ The athlete set a new world record. develop ﻳﻄﻮر The city plans to develop a new park. bit ﻗﻠﻴﻞ Can I have a bit of your sandwich? share ﻳﺸﺎر ك Let's share ideas during the brainstorming session. real ﺣ ﻘﻴﻘﻲ The painting looks like a real masterpiece. figure ﺷﺨﺼﻴﺔ She is a prominent figure in the field of science. 🦊 اﻟﻤﺴﺘﻮى اﻟﻤﺘﻮﺳﻂ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل decide ﻳﻘﺮر We need to decide on a date for the event. development اﻟﺘﻄﻮر Technological development is rapid. break راﺣﺔ Take a break and grab some coffee. clear واﺿﺢ The instructions should be clear for everyone. future ﻣﺴﺘﻘﺒﻞ Saving money is important for future plans. state ﺣ ﺎﻟﺔ The project is currently in a state of development. process ﻋﻤﻠﻴﺔ Learning is a gradual process that takes time and effort. concern ﻗﻠﻖ Environmental concern is growing globally. rate ﻣ ﻌﺪل The interest rate on the loan is reasonable. cause ﺳﺒﺐ The storm was the cause of the power outage. deal ﺻﻔﻘﺔ Let's make a deal that benefits both parties. force ﻗﻮة The strong wind exerted a powerful force against the trees. policy ﺳﻴﺎﺳﺔ The company has a strict policy. major ر ﺋﻴﺴﻲ The economic downturn caused a major setback. community ﻣﺠﺘﻤﻊ The community came together to clean the park. economic اﻗﺘﺼﺎدي Economic growth is a priority for many nations. claim ﻳﺰﻋﻢ Scientists claim that the experiment was successful. fund ﺗﻤﻮﻳﻞ The school received a generous fund for new equipment. measure ﻗﻴﺎس Take the necessary measure to ensure safety. risk ﻣﺨﺎﻃﺮة Investing in stocks carries a certain level of risk. standard ﻣ ﻌﻴﺎر The product meets the industry standard. focus ﻳﺮﻛﺰ She needs to focus on her presentation preparation. data ﺑﻴﺎﻧﺎت Big data analytics help in decision-making. current ﺣ ﺎﻟﻲ The current situation requires immediate attention. evidence دﻟﻴﻞ The fingerprints are crucial evidence in the case. 🦊 اﻟﻤﺴﺘﻮى اﻟﻤﺘﻮﺳﻂ اﻟﻜﻠﻤﺔ ا ﻟ ﻤﻌﻨ ﻰ ﻣﺜﺎل response رد The quick response to the fire saved lives. source ﻣﺼﺪر The internet is a vast source of information. cell ﺧ ﻠﻴﺔ The human body is made up of countless cells. feature ﺧ ﺎﺻﻴﺔ The new phone has an impressive camera feature. factor ﻋﺎﻣﻞ Time management is a crucial factor for success. affect ﻳﺆﺛﺮ The change in weather may affect the outdoor event. official ر ﺳﻤﻲ The president made an official announcement. campaign ﺣﻤﻠﺔ The political campaign focused on education reform. represent ﻳﻤﺜﻞ The national flag can represent a country's identity. structure ﻫﻴﻜﻞ The building has a modern and innovative structure. growth ﻧﻤﻮ Economic growth is essential for prosperity. influence ﻳﺆﺛﺮ Positive role models can influence young minds. stock ﻣﺨﺰون Investors monitor the stock market closely. management إ دا رة Effective management is crucial for the project. establish ﻳﺸﻴﺪ The company aims to establish a global presence. economy اﻗﺘﺼﺎد The pandemic had an impact on the economy. function وﻇﻴﻔﺔ Regular exercise is vital for the function of the body. image ﺻﻮ رة A positive public image is important for businesses. determine ﻳﺤﺪد Hard work and dedication often determine success. production إﻧﺘﺎج The factory increased production to meet demand. occur ﻳﺤﺪث Accidents can occur unexpectedly. significant ﻫﺎم The discovery was a significant breakthrough. drug دواء Scientists are researching a drug to treat the disease. analysis ﺗﺤﻠﻴﻞ The data analysis revealed interesting trends. military ﻋﺴﻜﺮي The military conducted a training exercise. 🦊 اﻟﻤﺴﺘﻮى اﻟﻤﺘﻮﺳﻂ اﻟﻜﻠﻤﺔ ا ﻟ ﻤﻌﻨ ﻰ ﻣﺜﺎل nation أﻣﺔ Independence Day celebrates the birth of the nation. statement ﺑﻴﺎن The CEO issued a statement regarding the plans. seek ﻳﺒﺤﺚ ﻋﻦ Students seek knowledge. agreement اﺗﻔﺎق The two parties reached a mutual agreement. release ﻳﻄﻠﻖ The company will release a new product next month. specific ﻣﺤﺪد Provide specific details about the incident. target ﻫﺪف The advertisement is designed to target young adults. movement ﺣ ﺮﻛﺔ The movement of the train was smooth and steady. treat ﻳﻌﺎﻟﺞ Honey is often used to treat sore throats. identify ﻳﺘﻌﺮف ﻋﻠﻰ Can you help me identify this mysterious plant? loss ﺧ ﺴﺎر ة The company suffered a financial loss last quarter. pressure ﺿﻐﻂ High pressure systems often bring clear skies. treatment ﻋﻼج The patient is undergoing a new cancer treatment. supply إﻣﺪاد Ensure a steady supply of essential goods. express ﻳﻌﺒﺮ Art is a way to express emotions and ideas. indicate ﻳﺸﻴﺮ إ ﻟﻰ The rising temperature may indicate a problem. investment ا ﺳﺘﺜﻤﺎر Real estate can be a lucrative investment. potential ا ﻣ ﻜﺎﻧﻴﺔ The young athlete shows great potential. suffer ﻳﻌﺎﻧﻲ ﻣﻦ Many people suffer from seasonal allergies. strategy ا ﺳﺘﺮا ﺗﻴﺠﻴﺔ Developing a clear strategy is key to success. network ﺷﺒﻜﺔ Building a professional network is important for growth. task ﻣﻬﻤﺔ Completing the report is your primary task. associate ﻳﺮﺑﻂ The company decided to associate with a reputable brand. assume ﻳﻔﺘﺮض Never assume without proper information. theory ﻧﻈﺮﻳﺔ The scientist proposed a new theory of relativity. 🦊 اﻟﻤﺴﺘﻮى اﻟﻤﺘﻮﺳﻂ اﻟﻜﻠﻤﺔ ا ﻟ ﻤﻌﻨ ﻰ ﻣﺜﺎل propose ﻳﻘﺘﺮح The committee will propose changes to the policy. reference ﻣﺮﺟﻊ Always check the reference before citing a source. unclear ﻏﻴﺮ واﺿﺢ The instructions were unclear, causing confusion. profit رﺑﺢ The business aims to generate a substantial profit. resource ﻣﺼﺪر Renewable energy is an essential resource for the future. balance ﺗﻮازن Maintaining a healthy work-life balance is crucial. basis أ ﺳﺎس The decision was made on the basis of merit. reflect ﻳﻌﻜﺲ The calm lake reflects the surrounding mountains. income دﺧﻞ Proper financial planning can increase your income. define ﻳﻌﺮف It's essential to clearly define your goals. debate ﻣﻨﺎﻗﺸﺔ The candidates engaged in a spirited debate. Maintain اﻟﺤﻔﺎظ ﻋﻠﻰ Regular exercise helps maintain good health. extend ﻳﺘﻮﺳﻊ We plan to extend the contract for another year. facility ﺗﺴﻬﻴﻼت The new facility includes state-of-the-art equipment. responsibility ﻣﺴﺆوﻟﻴﺔ It's our responsibility to protect the environment. legal ﻗﺎﻧﻮﻧﻲ Always seek legal advice before making decisions. proposal ﻋﺮض The team submitted a proposal for the new project. version إﺻﺪار Ensure you have the latest version of the software. agent وﻛﻴﻞ The real estate agent helped us find our dream home. estimate ﻳﻘﺪر The contractor provided an estimate for the renovation. purchase ﻳﺸﺘﺮي I'm planning to purchase a new car next month. survey ا ﺳﺘﻄ ﻼ ع رأ ي A survey was conducted to gather public opinion. majority أﻏﻠﺒﻴﺔ The majority of the team supported the idea. budget ﻣﻴﺰاﻧﻴﺔ Creating a budget is key to financial stability. appropriate ﻣ ﻨﺎﺳﺐ Choose appropriate attire for the formal event. 🦊 اﻟﻤﺴﺘﻮى اﻟﻤﺘﻮﺳﻂ اﻟﻜﻠﻤﺔ ا ﻟ ﻤﻌﻨ ﻰ ﻣﺜﺎل content ﻣﺤﺘﻮى The website's content is informative and engaging. element ﻋﻨﺼﺮ Oxygen is a crucial element for human survival. effective ﻣﺆﺛﺮ Good communication is essential for effective teamwork. medical ﻃﺒﻲ The medical exam revealed no serious issues. committee ﻟﺠﻨﺔ The committee will review the proposed changes. aware واﻋﻲ I am aware about that. trial ﻣﺤﺎﻛﻤﺔ I will attend the trial tomorrow. administration إ دا رة The administration helps everything run smoothly. complex ﻣ ﻌﻘ ﺪ Building a big tower with blocks can be complex. context ﺳﻴﺎق The story is easier when you know the context. conduct ﺳﻠﻮك Good conduct means being polite and kind to others. executive ﺗﻨﻔﻴﺬي An executive is someone who helps make big decisions. sample ﻋﻴﻨﺔ I tried a sample of the new ice cream flavor. primary أ ﺳﺎﺳﻲ My primary colors are red, blue, and yellow. principle ﻣﺒﺪأ Being honest is a good principle to follow. appeal ﺟ ﺎذﺑﻴﺔ The colorful flowers have a strong appeal. highly ﻟﻠﻐﺎﻳﺔ I'm highly excited about my birthday. additional إﺿﺎﻓﻲ I brought some additional snacks to share. alternative ﺑﺪﻳﻞ If it rains, we'll find an alternative game to play. observe ﻳﺮاﻗﺐ I like to observe birds in the park. examine ﻳﻔﺤﺺ The doctor will examine you. slightly ﻗﻠﻴﻼ I'm slightly taller than my younger brother. overall ﻋﺎم The overall feeling at the party was happiness. respond ﻳﺮد I respond with a smile when someone says hello. physical ﺑﺪﻧﻲ Playing sports is good for your physical health. 🦁 اﻟﻤﺴﺘﻮى اﻟﺼﻌﺐ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل reveal ﻳﻜﺸﻒ The magician will reveal a surprise. percentage ﻧﺴﺒﺔ I ate a small percentage of the cake. status ﺣ ﺎﻟﺔ My status is happy with a new toy. decline اﻧﺨﻔﺎض Flowers declined without enough water. launch ﻳﻄﻠﻖ We'll launch colorful balloons. consumer ﻣﺴﺘﻬﻠﻚ A consumer buys things from the store. institution ﻣﺆﺳﺴﺔ The library is an institution for reading. eventually ﻣﺆﺧﺮﴽ Practice, and you'll get better eventually. sector ﻗﻄﺎع Farming is part of the agricultural sector. ensure ﻳﻀﻤﻦ I'll ensure you have a seat. satisfy رﺿﺎ A yummy snack will satisfy hunger. chief ر ﺋﻴﺲ The chief makes important decisions. surface ﺳﻄ ﺢ The cat sat on the warm surface procedure إﺟﺮاء Following the procedure ensures smoothness. global ﻋﺎﻟﻤﻲ Learning about countries is a global experience. struggle ﻛﻔﺎح Climbing the big hill was a struggle. extent ﺣﺪ The extent of the forest surprised us. contrast ﺗﺒﺎﻳﻦ The black cat contrasts with the white one. reality اﻟﻮاﻗﻊ The reality is, we finish homework. conflict ﺻﺮاع The conflict was resolved with a friendly talk. entire ﻛﺎﻣﻞ I ate the entire pizza; it was yummy. presence ﺣﻀﻮر Your presence makes the party more fun! shift ﻳﺤﻮل Weather can suddenly shift. category ﻓﺌﺔ Animals are sorted into categories. spread اﻻﻧﺘﺸﺎر The news spread quickly in the town. 🦁 اﻟﻤﺴﺘﻮى اﻟﺼﻌﺐ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل nuclear اﻟﻨﻮوي Nuclear energy comes from atoms. scale ﺣ ﺠﻢ I weigh things on a small scale. introduction ﻣﻘﺪﻣﺔ The book has an interesting introduction. requirement ﻣﺘﻄﻠﺐ Meeting all the requirements is important. senior ﻛﺒﻴﺮ Grandma is a senior member of our family. emerge ﻳﻈﻬﺮ Flowers emerge in the spring. concept ﻣﻔﻬﻮم Understanding a new concept takes time. reform ا ﻋﺎدة ﺗﺸﻜﻴﻞ People advocate for education reform. neither ﻻ اﺣﺪ Neither cat likes water. survive ﻳﻨﺠﻮ Animals need to survive in the wild. consequence ﻋﺎﻗﺒﺔ Bad choices have consequences. circumstance ﻇﺮف We adapt to different circumstances. reaction ر د ﻓﻌﻞ His reaction to the surprise was funny. mass ﻛﺘﻠﺔ Planets have a lot of mass. contribute ﻳﺴﺎﻫﻢ Everyone can contribute something positive. failure ﻓﺸﻞ Failure teaches us valuable lessons. schedule ﺟﺪول I have a busy schedule today. adopt ﻳﺘﺒﻨﻰ Families can adopt pets. combine ﻳﺠﻤﻊ We combine colors to make new ones. expression ﺗﻌﺒﻴﺮ A smile is a happy expression. commercial ﺗﺠﺎر ي TV shows have commercial breaks. strength ﻗﻮة Exercise builds physical strength. scheme ﻣﺨﻄﻂ The students had a scheme for the project. payment ﻗﺴﻂ I made a payment for the new book. demonstrate ﻳﻮﺿﺢ Teachers demonstrate how to solve problems. 🦁 اﻟﻤﺴﺘﻮى اﻟﺼﻌﺐ اﻟﻜﻠﻤﺔ ا ﻟ ﻤﻌﻨ ﻰ ﻣﺜﺎل contribution ﻣﺴﺎﻫﻤﺔ My contribution to the project was helpful. appreciate ﺪر ﻳُ ﻘ َ ﱢ I appreciate your kind words. apparently ﻓﻴﻤﺎ ﻳﺒﺪو Apparently, the cake disappeared quickly. critical ﺷﺪﻳﺪ ا ﻷﻫﻤﻴﺔ Following instructions is critical for safety. gather ﻳﺠﻤﻊ Let's gather flowers for Mom. desire ﻳﺮﻏﺐ My desire is to learn new things. currently ﺣ ﺎﻟﻴﴼ Currently, I'm reading a good book. engage ﻳﺸﺎر ك We engage in fun activities together. crisis ازﻣﺔ During a crisis, people help each other. settle ﻳﺴﺘﻘﺮ Birds settle in nests for the night. aid ﻳﺴﺎﻋﺪ First aid helps when someone is hurt. safety أﻣﺎن Wearing a helmet ensures safety. insurance ﺗﺄﻣﻴﻦ Insurance protects against accidents. investigation ﺗﺤﻘﻴﻖ The detective started an investigation. package ﻃﺮد َ I received a package in the mail. expand ﻳﻮﺳﻊ We want to expand our garden. commit ﻳﺘﻌﻬﺪ I commit to finishing my homework. weapon ﺳﻼح Soldiers use weapons to protect. relatively ﻧﺴﺒﻴﴼ It's relatively warm outside today. host ﻣﻀﻴﻒ The host welcomed everyone to the party. tire ﻳﺘﻌﺐ I tire after playing for a long time. spirit روح Team spirit helps us win games. actual ﻓِ ﻌ ﻠ ﻲ The actual size surprised me. tradition اﻟﺘﻘﻠﻴﺪ It's a tradition to celebrate birthdays. award ﺟ ﺎﺋﺰة Winning an award made her happy. 🦁 اﻟﻤﺴﺘﻮى اﻟﺼﻌﺐ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل consideration اﻋﺘﺒﺎر Taking turns is a consideration in games. code ﺷﻔﺮة A secret code unlocks the treasure chest. threat ﺗﻬﺪﻳﺪ The dark clouds are a threat of rain. revenue رﺑﺢ Selling products generates revenue for the company. enable ﻜﻦ َِ ﻳُﻤ Exercise can enable better health. conclude ﻧﺴﺘﻨﺘﺞ We conclude the story with a happy ending. religious دﻳﻨﻲ People go to religious places to pray. vary ﺗﺨﺘﻠﻒ People's preferences vary invest ﻳﺴﺘﺜﻤﺮ People invest money to make it grow. proceed ﻳﺘﺎﺑﻊ After a pause, we can proceed with the game. whereas ﺑﻴﻨﻤﺎ She likes apples, whereas he prefers oranges. monitor ﺷﺎﺷﺔ The teacher uses a monitor to watch the class. finance ﺗﻤﻮﻳﻞ Finance helps manage money in a business. recall ﻳﺘﺬﻛﺮ I can recall my favorite childhood toy. manufacture ﺻﻨﺎﻋﺔ Factories manufacture cars and toys. freedom ﺣﺮﻳﺔ Freedom allows us to make choices. construction ﺑﻨﺎء Construction workers build houses and roads. objective ﻫﺪف The objective of the game is to score points. moreover ﻋﻼوة ﻋﻠﻰ ذﻟﻚ I like ice cream, and moreover, I love chocolate. oppose ﻳﻌﺎرض Some people oppose certain laws. bind رﺑﻂ The rope can bind things together. belong ﻳﻨﺘﻤﻲ The lost key might belong to the blue door. council ﻣﺠﻠﺲ The council makes important decisions for the town. editor ﻣﺤﺮر An editor reviews and improves written work. generate ﻳﻮﻟﺪ Wind turbines generate electricity. 🦁 اﻟﻤﺴﺘﻮى اﻟﺼﻌﺐ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل deny ﻳﻨﻜﺮ She will deny eating the last cookie. quote ﻳﻘﺘﺒﺲ The teacher asked us to quote a famous line. basically ﺳﺎ ً أ ﺳﺎ Basically, pizza is made of dough, sauce, and cheese. violence ﻋﻨﻒ We should work against violence in society. minister وزﻳﺮ The minister leads important government departments. manner ﻃﺮﻳﻘﺔ Good manners make people pleasant to be around. ignore ﻳﺘﺠﺎﻫﻞ It's not polite to ignore someone's question. affair ﺷﺄن Personal affairs should be handled with care. civil ﻣﺪﻧﻲ Civil rights ensure fair treatment for all citizens. citizen ﻣﻮاﻃﻦ A responsible citizen follows the laws. domestic ﻣﺤﻠﻲ Domestic animals live with people in homes. belief اﻻﻋﺘﻘﺎد Respect for different beliefs promotes harmony. technical ّا ِ ﺻ ﻄ ِ ﻼ ﺣ ِ ﻲ Technical skills are essential in many jobs. acquire ﻳﻜﺘﺴﺐ Through hard work, you can acquire new skills. corporate ﺷﺮﻛﺔ ﻛﺒﺮى Corporate offices often have strict dress codes. Participation ﻣﺸﺎر ﻛﺔ Participation in class discussions is encouraged. tough س ٍ ﻗﺎ Solving puzzles can be tough but fun. representative ﻣﻤﺜﻞ A representative speaks for a group of people. capacity ﺳﻌﺔ The brain has a remarkable capacity to learn. assessment ﺗﻘﻴﻴﻢ Teachers use assessments to measure understanding. regulation أﻧﻈﻤﺔ Traffic regulations keep roads safe. component ﻋﻨﺼﺮ Each part is a crucial component of the machine. suspect ﻳﺸﺘﺒﻪ The detective questioned the suspect. confidence ﺛﻘﺔ Success builds confidence in one's abilities. industrial ﺻﻨﺎﻋﻲ Industrial areas often have factories and warehouses. 🦁 اﻟﻤﺴﺘﻮى اﻟﺼﻌﺐ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل perspective وﺟﻬﺔ ﻧﻈﺮ This is my perspective. error ﺧﻄﺄ Please correct the error in your calculation. assess ﻳٌﻘﱢﻴﻢ Teachers assess students' understanding through tests. asset أﺻﻞ Time is a valuable asset; use it wisely. signal ا ﻹﺷﺎر ة The traffic light turned red, a signal to stop. relevant ﻣ ﻨﺎﺳﺐ Include only relevant information in your report. leadership ﻗﻴﺎدة Good leadership inspires and guides a team. commitment اﻟﺘﺰام Long-term commitment leads to success. necessarily ﺑﺎﻟﻀﺮور ة Not all dogs necessarily like to swim. bond راﺑﻄﺔ Friendship is a strong bond between people. internal داﺧﻠﻲ Internal organs work together for health. victim ﺿﺤﻴﺔ We must support victims of injustice. threaten ﻫﺪد He didn't mean to threaten him. division ﻗﺴﻢ The company has a marketing division. secure ﻳﺆﻣﻦ Lock the door to keep the house secure. device ﺟ ﻬﺎز A smartphone is a handy device. root ﺟﺬر The root of the tree goes deep into the ground. expense ﻣﺼﺮوف Traveling can be an expensive experience. investigate ﻳﻔﺘﺶ The detective will investigate the case. recommendation ﺗﻮﺻﻴﺔ I appreciate your recommendation for a good book. rank ر ﺗﺒﺔ The soldiers were proud of their high rank. resident ﻣﻘﻴﻢ A resident lives in a particular place. provision ﺗﻮﻓﻴﺮ The hotel made a special provision for allergies. export ﺪر ّ ﻳﺼ The country exports goods to other nations. entirely ﺗﻤﺎﻣﺎ The puzzle was entirely solved by the child. 🦁 اﻟﻤﺴﺘﻮى اﻟﺼﻌﺐ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل strongly ﺑﻘﻮة She strongly disagreed with the decision. graduate ﻳﺘﺨﺮج After hard work, she will graduate next year. brand ﻣﺎر ﻛﺔ Coca-Cola is a well-known brand. moral أﺧﻼﻗﻲ Kindness is a moral value we should embrace. combination ﻣﺰﻳﺞ The cake had a delightful combination of flavors. abuse إ ﺳﺎءة We should never tolerate any form of abuse. master ﻳﺘﻘﻦ He worked hard to master the art of cooking. nevertheless ﻣﻊ ذﻟﻚ It was raining; nevertheless, we went for a walk. protection ﺣ ﻤﺎﻳﺔ Helmets provide protection during bike rides. largely إﻟﻰ ﺣ ﺪ ﻛﺒﻴﺮ The success was largely due to teamwork. guarantee ﻳﻀﻤﻦ The warranty is a guarantee of product quality. theme ﺳﻤﺔ The theme of the story was about friendship. judgment ﺣ ﻜﻢ Good judgment is essential in decision-making. odd ﻏﺮﻳﺐ Seeing a penguin in the desert is odd. definition ﺗﻌﺮﻳﻒ A dictionary provides the definition of words. elect اﻟﻤﻨﺘﺨﺐ Citizens have the right to elect their leaders. comparison ﻣ ﻘ ﺎرﻧﺔ The teacher asked for a comparison between the books. characteristic ﺻﻔﺔ ﻣﻤﻴﺰة One characteristic of cats is their agility. identity ﻫﻮﻳﺔ Your name is part of your identity. unique ﻓﺮﻳﺪ Each snowflake is unique in its design. association ﻣﻨﻈﻤﺔ She joined the writers' association. investor ﻣﺴﺘﺜﻤﺮ An investor puts money into businesses. practical ﻋﻤﻠﻲ Learning practical skills is important. expectation ﺗﻮﻗﻊ Meeting expectations can lead to success. sexual ﺟ ﻨﺴﻲ Respectful behavior includes avoiding sexual harassment. 🦁 اﻟﻤﺴﺘﻮى اﻟﺼﻌﺐ اﻟﻜﻠﻤﺔ اﻟﻤﻌﻨﻰ ﻣﺜﺎل increasingly ﻋﻠﻰ ﻧﺤ ﻮ ﻣﺘ ﺰاﻳﺪ People are increasingly using online shopping. import ﻳﺴﺘ ﻮ رد The country relies on the import of electronics. cast ﻓ ﺮﻳﻖ The director chose a talented cast for the movie. notion ﻓ ﻜﺮة The notion of time varies among cultures. conservative ﻣﺤ ﺎﻓ ﻆ Some people hold conservative views on social issues. opposition ﻣﻌﺎر ﺿ ﺔ The opposition party criticizes government decisions. relief ِارِﺗﻴﺎح A cool breeze brought relief from the heat. debt َدﻳﻦ Student loans can lead to significant debt. outcome ﺣ ﺼﻴ ﻠ ﺔ Hard work often leads to a positive outcome. arise ﺗﻨﺸﺄ Challenges may arise unexpectedly. stretch ﺗﻤﺘﺪ The cat did a stretch after waking up. native ﻣﺤ ﻠﻲ The kangaroo is native to Australia. witness ﺷ ﺎﻫﺪ He was a witness to the accident. researcher اﻟﺒﺎﺣ ﺚ The researcher studied the effects of climate change. selection اﺧ ﺘ ﻴﺎر The chef made a delicious selection of dishes. mental ﻋﻘﻠﻲ Meditation can improve mental well-being. Culture ﺛﻘﺎﻓﺔ Each country has its own unique culture. vision ر ؤﻳﺔ A clear vision guides successful projects. personality ﺷ ﺨ ﺼﻴﺔ Personality traits influence behavior. specifically ﺧ ﺎﺻ ﺔ The instructions were specifically for beginners. fellow زﻣﻴﻞ She works closely with her fellow researchers. chemical ﻛﻴﻤﻴﺎﺋﻲ The scientist studied the chemical composition. capture ﻳﻠ ﺘﻘﻂ The photographer tried to capture the sunset. proportion ﺣَ ﺠ ﻢ Maintain a balanced proportion in your diet. constant ﺛﺎﺑﺖ The speed of light is a constant in physics.