Standard deviation : ব্যত্যয় প্রমাপ;
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Appropriate Prepositions
Absent from(অনুপস্থিত থাকা): I was absent from the class yesterday.
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
Object to (প্রতিবাদ করা): Many people objected to the remarks of the leader.
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Idioms
Art and part (অভিসন্ধি ও সম্পাদন) We have no art and part in his affairs.
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 play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.