Centre of mass : ভরকেন্দ্র;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Die for (আত্নত্যাগ করা): Our Chairman died for our country.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Play at (খেলা): I do not play at cards.
Solution to (সমাধান): None can solution to every problem.
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Idioms
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Pack up a quarrel (ঝগড়া মিটানো)— He packed up their quarrel.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.