Infrasonic : অবশ্রব্য;
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Appropriate Prepositions
Care of(যত্ন নেওয়া): You should take care of your health.
Certain of(নিশ্চিত): Jamal is certain of his success.
Desire for (আকাঙ্ক্ষা করা): He has no desire for money.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Meet with (হঠাৎ কোন কিছু হওয়া): Yesterday I met with an accident.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
In vogue (চালু): This custom is not in vogue at present.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
Well off (স্বচ্ছল) - Jim and Della were not well off.