Centre of mass : ভরকেন্দ্র;
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Appropriate Prepositions
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Catch at(ধরা): A drowning man catches at a straw.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Dwell in (বাস করা): He dwells in a tall apartment.
Shocked at (মানসিক আঘাতপ্রাপ্ত): Snigdha was terribly shocked at the death of Ratul.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
Worthy of (যোগ্য) - He is worthy of a good job.