Prophylactic : নিবারক, রোগ নিবারক ওষুধ;
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Appropriate Prepositions
Business with (ব্যবসা, কাজ): He is pleased to do business with you.
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Devoted to (মনোযোগী): He is devoted to music.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.