Orbital velocity : কক্ষ-ভরবেগ;
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Appropriate Prepositions
Arrive at(উপস্থিত হওয়া, পৌছানো): The train arrived at Dhaka station on time.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Infested with (অতিষ্ঠ): The room is infested with rats.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Short temper (রগচটা)— He is a man of short temper.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.