Radio frequency : রেডিও তরঙ্গের কম্পাঙ্ক;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Business with (ব্যবসা, কাজ): He is pleased to do business with you.
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
Sorry for (দুঃখিত): He is sorry for his misdeeds.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
To the point (সঠিক) - The boy answered the question to the point.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.