Molecular weight : আণবিক গুরুত্ব;
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Appropriate Prepositions
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Attentive to(মনোযোগী): He is attentive to his business.
Capable of(সক্ষম): He is capable of doing it.
Care of(যত্ন নেওয়া): You should take care of your health.
Dwell in (বাস করা): He dwells in a tall apartment.
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Idioms
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
In a fix (মুশকিলে পতিত হওয়া): The man is in a fix with his new hairstyle.
In no time (শীঘ্র): He will finish the work in no time.