Waveband : তরঙ্গদৈর্ঘ্যের নির্দিষ্ট পাল্লা;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Apart from(ছাড়া, ব্যতীত, দূরে): They pave apart from each other.
Associate with, in(জড়িত হওয়া): This man was associated with crime.
Call in(ডাকিয়া আনা): They called in a doctor.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Slow coach (অলস): You cannot expect much from a slow coach.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.