Nuclear fission : কেন্দ্রকীয় বিদারণ; নিউক্লীয় বিদারণ;
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nuclear fission  nuclear fusion  See Words Also In
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Appropriate Prepositions
Anxious for (কারোর ব্যাপারে চিন্তিত): Sabbir was anxious for her.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Rely on (নির্ভর করা): We should not rely on a lazy man.
Smile on/upon (অনুগ্রহ করা): Fortune smiles on/upon the brave.
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Idioms
All in - (পরিশ্রান্ত): I was all in after the meeting.
In a fix (মুশকিলে পতিত হওয়া): The man is in a fix with his new hairstyle.
Sheet anchor (শেষ আশ্রয়; প্রধান অবলম্বন; আসল খুঁটি)— This small piece of land is his sheet anchor.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.