Centre of mass : ভরকেন্দ্র;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Debar from (বঞ্চিত হওয়া/বাধা দেওয়া): He is debarred from getting a job.
Make up of (গঠিত): Village is made up of many homes.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
Welcome to (স্বাগত জানানো): You are welcome to our new office.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.
Without fail (অবশ্যই) - You must attend the meeting without fail.