Extinction angle : কুণ্ঠন কোণ; লোপ-কোণ;
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Appropriate Prepositions
Absent from(অনুপস্থিত থাকা): I was absent from the class yesterday.
Apology to (কারো কাছে ক্ষমা চাওয়া): Rakib should ask apology to her.
Consent to(মত দেওয়া): The Prime Minister consented to the proposal.
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
Identical with (একই ধরণের): You are identical with your sister.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Fair and square (সৎ): The learned persons should be fair and square.
In no time (শীঘ্র): He will finish the work in no time.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.