Atomic mass : পারমাণবিক ভর;
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Appropriate Prepositions
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Fantasize about (কল্পনা করা): They fantasized about winning the lottery.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Hope for (আশা করা): Let us hope for the best.
Infested with (অতিষ্ঠ): The room is infested with rats.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Safe and sound (নিরাপদে)— He reached home safe and sound.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.