Conservation of energy : শক্তির নিত্যতা;
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Appropriate Prepositions
Aptitude for(স্বাভাবিক দক্ষতা, যোগ্যতা): He has no aptitude for public service.
Caution against(সাবধান): Take all cautions against the danger.
Deal in, with, out (ব্যবসা করা, ব্যবহার করা, বন্টন করা): The man deals in rice. He does not know how to deal with a customer. The Chairman dealt out the relief materials to the flood affected people.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
At a discount (অনাদৃত) Female education is no longer at a discount now.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
In the long run (পরিণামে): You will have to suffer in the long run.
To the brim (কানায় কানায়) - The river was full to the brim.