Molecular weight : আণবিক গুরুত্ব;
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Appropriate Prepositions
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
Penalty for, with (দণ্ড, জরিমানা): She has paid the penalty for the misuse of power with two years in prison.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
Run into (জড়িয়ে পড়া): He had run into debt.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
For good (চিরদিনের জন্য): He left the house for good.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.