Wavelengths : তরঙ্গদৈর্ঘ্য; মধ্যবর্তী ব্যবধান;
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Appropriate Prepositions
Bar to(বাধা): Poverty is not a bar to happiness.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Indulge in (আসক্ত): You should not indulge in social media.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.