Mainframe : বড় কম্পিউটারের অন্য নাম;
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Appropriate Prepositions
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Affection for(স্নেহ): She has a great affection for the child.
Indulge in (আসক্ত): You should not indulge in social media.
Lost in (মগ্ন): Simon is lost in meditation.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
All along - (সব সময়): I was present in the meeting all along.
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.