Profi ciency : দক্ষতা; কুশলতা; বু্যত্পত্তি;
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profi ciency  proficiencies  proficiency  See Words Also In
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Appropriate Prepositions
Admit into(প্রবেশ করতে দেওয়া): Only the selected people were admitted into the theater.
Afraid of(ভীত): An honest man is not afraid of telling the truth.
Competent for(যোগ্য): He is not competent for the post.
Independent of (স্বাধীন): They are independent of my health.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Run short (কমতি পড়া) —I ran short of money.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.