Plano-concave : সমাবতল;
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Appropriate Prepositions
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Change into (পরিবর্তিত হওয়া): At what point does boiling water change into vapor.
Curse for (অভিশাপ দেয়া): If he ever mistreats my parents, I will certainly curse him for it.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Object to (প্রতিবাদ করা): Many people objected to the remarks of the leader.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
Bear in mind (মনে রাখা): Always bear in mind that you are a daughter of a reputed person.
Far and wide (সর্বত্র): His fame spread far and wide.
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.