Critical angle : সংকট-কোণ;
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Appropriate Prepositions
Akin to(সমজাতীয়): These are akin to one another.
Antipathy to/towards (ঘৃনা): I have a strong antipathy to smoking.
Aptitude for(স্বাভাবিক দক্ষতা, যোগ্যতা): He has no aptitude for public service.
Ashamed of(লজ্জিত): Nandini was ashamed of his wrong-doing.
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
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Idioms
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
In black and white – (লিখিতভাবে) – Put forward your proposal in black and white.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.
Right and left (এলোপাথাড়ি - indiscriminately): He planted trees right and left.
Run high (বেড়ে যাওয়া) —The price of everything has run high.