Escape velocity : উত্তরণবেগ; মুক্তিবেগ;
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Appropriate Prepositions
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
Look at (তাকানো): Students look at the blackboard.
Quarrel with (ঝগড়া করা): Some girls quarreled with one another.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Bad names (গালমন্দ—n) He called the man bad names.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Well off (স্বচ্ছল) - Jim and Della were not well off.