Angle of refraction : প্রতিসরণ-কোণ;
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Appropriate Prepositions
Afraid of(ভীত): An honest man is not afraid of telling the truth.
Agree to(ব্যক্তি ছাড়া অন্যকিছুর সাথে একমত হওয়া): We cannot agree to your proposal.
Breakdown of (বিস্তারিত): Here is statistical breakdown of data.
Rely on (নির্ভর করা): We should not rely on a lazy man.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Cut to the quick (মর্মাহত হওয়া): I was cut to the quick by his birds.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Nip in the bud (অঙ্কুরে বিনষ্ট হওয়া): All his hopes were nipped in the bud.