Quality control : গুণ নিয়ন্ত্রণ;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Apart from(ছাড়া, ব্যতীত, দূরে): They pave apart from each other.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.