Pneumatic trough : গ্যাসদ্রোণী;
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Attentive to(মনোযোগী): He is attentive to his business.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.