Refractoriness : ঠেঁটাম; তাপ রোধক পদার্থ;
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Appropriate Prepositions
Angry for (কোন কাজে রাগান্বিত হওয়া): Rahim was angry with me for my having done this.
Arrive at(উপস্থিত হওয়া, পৌছানো): The train arrived at Dhaka station on time.
Concerned with(জড়িত): She was concerned with such things.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Run after (পশ্চাদানুসরণ করা): Do not run after money.
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Idioms
Run high (বেড়ে যাওয়া) —The price of everything has run high.
Set out (যাত্রা করা)— I will set out in time.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.