Coefficient of friction : ঘর্ষণাঙ্ক;
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Appropriate Prepositions
Anxious about (কোনো কিছুর ব্যাপারে চিন্তিত বা উদ্বিগ্ন): Karim is anxious about his father’s death. Karim is anxious for getting a job.
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Convert to(দীক্ষিত): Tom is converted to another religion.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Make of (কোনো উপকরণ দ্বারা সরাসরি তৈরী বোঝাতে): This necklace is made of gold.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.