Tachometer : চক্রাকারে আবর্তনের গতিমাপক যঁত্র;
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Appropriate Prepositions
Adequate for(পর্যাপ্ত): The loan given by the bank is not adequate for the farming project.
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Consistent with(সামঞ্জস্যপূর্ণ): Your action is not consistent with your word.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Refer to (সিদ্ধান্তের জন্য প্রেরণ করা): The matter was referred to the Chairman for a decision.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Crying need (জরুরী): Mass education is a crying need for India.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.