Standard deviation : ব্যত্যয় প্রমাপ;
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Appropriate Prepositions
Argue against (বিপক্ষে বলা): She argued against the bill.
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Count for(গণ্য বা বিবেচিত হওয়া): There can be no lasting peace without true democracy in which the people play a part and count for something.
Work for (কারো জন্য কাজ করা): She works for a construction company.
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Idioms
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
Riding for a fall (বেপরোয়াভাবে কাজ করা- to act recklessly): He rides for a fall in the election.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
Take into account (বিবেচনা করা): Your activities should be taken into account.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.