Radio activity : তেজস্ক্রিয়তা;
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Appropriate Prepositions
Acquit of (অব্যাহতি দেয়া): The chief justice acquitted him of the charge of murder.
Akin to(সমজাতীয়): These are akin to one another.
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Attend to(মনোযোগ দেওয়া): Please attend to my advice.
Hostile to (বিরোধী বা বিরূপ ভাবাপন্ন): Nobody is hostile to you.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Run short (কমতি পড়া) —I ran short of money.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.