Radio-isotope : কোনো মৌলিক পদার্থের তেজস্ক্রিয় রূপ;
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Appropriate Prepositions
Adorn with(সাজানো/সজ্জিত করা): Adorn the car with flowers.
Affection for(স্নেহ): She has a great affection for the child.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Informed of (অবহিত): I was not informed of your misfortune.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
All in - (পরিশ্রান্ত): I was all in after the meeting.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Cock and bull story (আষাঢ়ে গল্প): You must be ashamed of your cock and bull story.
Yellow dog (হীন ব্যক্তি) - A yellow dog is always hated by all.