Coefficient of friction : ঘর্ষণাঙ্ক;
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Appropriate Prepositions
Admit into(প্রবেশ করতে দেওয়া): Only the selected people were admitted into the theater.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Look at (তাকানো): Students look at the blackboard.
Quarrel with (ঝগড়া করা): Some girls quarreled with one another.
Recover from (সুস্থ হওয়া; পূর্ব অবস্থায় ফিরে আসা): The patient has not yet recovered from his severe illness.
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Idioms
All in - (পরিশ্রান্ত): I was all in after the meeting.
In a fix (মুশকিলে পতিত হওয়া): The man is in a fix with his new hairstyle.
Pin money (স্ত্রীর দেয়া হাত খরচ)— She saved her pin money.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.