Specific gravity : আপেক্ষিক গুরুত্ব;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Desist from (বিরত থাকা): She desisted from making this.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Fair and square (সৎ): The learned persons should be fair and square.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
Up to (পর্যন্ত) - I have done the exercises up to page 40.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.