Air navigation : অকাশ পরিবহণ; বিমান চালন;
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Appropriate Prepositions
Afraid of(ভীত): An honest man is not afraid of telling the truth.
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Quarrel with (ঝগড়া করা): Some girls quarreled with one another.
Shout at (চিৎকার করে ডাকা): Do not shout at your parents.
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Idioms
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
Round the clock (সমস্ত দিন): He is working round the clock.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.