Irreplaceable : অপূরণীয়;
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Appropriate Prepositions
Attacked with(আক্রান্ত): He is attacked with …
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
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Idioms
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
In vogue (চালু): This custom is not in vogue at present.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
Without fail (অবশ্যই) - You must attend the meeting without fail.