Orbital velocity : কক্ষ-ভরবেগ;
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Appropriate Prepositions
Care of(যত্ন নেওয়া): You should take care of your health.
Concerned with(জড়িত): She was concerned with such things.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Indulge in (প্রশ্রয় দেওয়া): You should not indulge in idleness.
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Idioms
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Safe and sound (নিরাপদে)— He reached home safe and sound.
See to (বিবেচনা করা)— Can you see to it that everyone gets a copy of this memo?
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.