Zero in on : লক্ষ্যবস্তুর দিকে তাক করা; কোনো কিছুর প্রতি মনোযোগ নিবদ্ধ করা;
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Appropriate Prepositions
Call on(কারও সাথে দেখা করা): I called on him in his office.
Deal with (কারো সাথে ব্যবহার বা আচরণ করা): Shahid can deal well with the customers.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Long for (আশা করা/কামনা করা): He longed for name and fame.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
In the long run (পরিণামে): You will have to suffer in the long run.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
Lump sum (এক কালীন) — He gave us lump sum money.