Relative velocity : আপেক্ষিক বেগ;
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Appropriate Prepositions
Creep up (বৃদ্ধি পাওয়া): The prices of are creeping up day by day.
Detrimental to (অপকারী): Smoking is detrimental to health.
Indulge in (প্রশ্রয় দেওয়া): You should not indulge in idleness.
Look after (দেখাশুনা): He looks after me.
Urge upon (আহবান জানানো): She urged upon his son the importance of being honest.
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Idioms
Bad names (গালমন্দ—n) He called the man bad names.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Set free (মুক্ত করা): The prisoners were set free.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?
Upper hand (প্রাধান্য) - He got the upper hand in the selection.