Crust of the earth : ভূ-ত্বক;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Assent to(সম্মতি দেওয়া): The President has assented to the bill.
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.