Relative velocity : আপেক্ষিক বেগ;
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Appropriate Prepositions
Competent for(যোগ্য): He is not competent for the post.
Indifferent to (উদাসীন): Everybody is indifferent to my problem.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
Meet with (হঠাৎ কোন কিছু হওয়া): Yesterday I met with an accident.
Refer to (সিদ্ধান্তের জন্য প্রেরণ করা): The matter was referred to the Chairman for a decision.
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Idioms
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Safe and sound (নিরাপদে)— He reached home safe and sound.
Set out (যাত্রা করা)— I will set out in time.