Radio-isotope : কোনো মৌলিক পদার্থের তেজস্ক্রিয় রূপ;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Averse to (বিমুখ): Rahim was averse of your various problems.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Enter into (কোনো কিছুতে আবদ্ধ হওয়া): pma entered into a new agreement.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
Set something right (ঠিক করা)— He will set the machine right.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.