Refractoriness : ঠেঁটাম; তাপ রোধক পদার্থ;
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Appropriate Prepositions
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Deal in, with, out (ব্যবসা করা, ব্যবহার করা, বন্টন করা): The man deals in rice. He does not know how to deal with a customer. The Chairman dealt out the relief materials to the flood affected people.
Hope for (আশা করা): Let us hope for the best.
Make up of (গঠিত): Village is made up of many homes.
Play on (বাজানো): They play on the piano.
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Idioms
Art and part (অভিসন্ধি ও সম্পাদন) We have no art and part in his affairs.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Sheet anchor (শেষ আশ্রয়; প্রধান অবলম্বন; আসল খুঁটি)— This small piece of land is his sheet anchor.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.