Demographer : জনতত্ত্ববিদ;
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Appropriate Prepositions
Bar to(বাধা): Poverty is not a bar to happiness.
Debar from (বঞ্চিত হওয়া/বাধা দেওয়া): He is debarred from getting a job.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
Repentant for (অনুতপ্ত): Kamal should be repentant for his misbehavior.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.