Relative density : আপেক্ষিক ঘনত্ব;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Bad at (অদক্ষ): He is not bad at English.
Consent to(মত দেওয়া): The Prime Minister consented to the proposal.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
Urge upon (আহবান জানানো): She urged upon his son the importance of being honest.
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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 home (comfortable— আরাম) He feels at home in Dhaka now.
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.