Penetrating : তীক্ষ্ন, তীক্ষ্ণবুদ্ধি;
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penetrating  penetrations  See Words Also In
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Appropriate Prepositions
Agree with(ব্যক্তির সাথে একমত হওয়া): I agree with you.
Desire for (আকাঙ্ক্ষা করা): He has no desire for money.
Detrimental to (অপকারী): Smoking is detrimental to health.
Plead for (ওকালতি করা): He pleads for justice.
Subject to (সাপেক্ষে): The man was appointed subject to the approval of the chairman.
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Idioms
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
Run into debt (ঋণগ্রস্ত হওয়া)— He ran into debt.
Short temper (রগচটা)— He is a man of short temper.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.