Lifescience : জীবতত্ত্ব;
Related Words
life science  life sciences  lifescience  See Words Also In
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Appropriate Prepositions
Control over(নিয়ন্ত্রণ): He has no control over his sons.
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Desire for (কামনা): He has no desire for fame.
Due to (কারণে): His absence is due to illness.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Brown study (day dream-দিবাস্বপ্ন -n) The woman is absorbed in a brown study.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.