Vacuum pump : নির্বাত অবস্থা পাম্প; ভ্যাকুয়াম পাম্প;
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Appropriate Prepositions
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
Object to (প্রতিবাদ করা): Many people objected to the remarks of the leader.
Render into (অনুবাদ করা): Render the passage into Bengap.
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Idioms
Burning question - (গুরুত্বপূর্ন বিষয়): Poverty problem is a burning question of our country.
Pack of lies (ডাঁহা মিথ্যা)—He told pack of lies to prove himself innocent.
Put up with (সহ্য করা - tolerate): I could not put up with his behavior.
Three score (ষাট): He is happy as his brother got three score.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.