Vacuum tube : অবাধ বিদ্যুত্প্রবাহের জন্য নির্মিত প্রায় বায়ুশূন্য বদ্ধ নল; নির্বাত-নলবিশেষ;
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Appropriate Prepositions
Bar to(বাধা): Poverty is not a bar to happiness.
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
Call in(ডাকিয়া আনা): They called in a doctor.
Damage to (ক্ষতি): The flood caused much damage to crops last year.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.