Plano-concave : সমাবতল;
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Appropriate Prepositions
Change into (পরিবর্তিত হওয়া): At what point does boiling water change into vapor.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Subject to (সাপেক্ষে): The man was appointed subject to the approval of the chairman.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
Riding for a fall (বেপরোয়াভাবে কাজ করা- to act recklessly): He rides for a fall in the election.
Run high (বেড়ে যাওয়া) —The price of everything has run high.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.