Cultured pearl : শুক্তির দেহের ভেতরে ঢুকিয়ে-দেওয়া পদার্থকে কেন্দ্র যে মুক্তো তৈরি হয়;
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Appropriate Prepositions
Appropriate to(যোগ্য): His answer is appropriate to the question.
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Effect of (প্রভাব): The effect of corruption is very harmful for our society.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Shocked at (মানসিক আঘাতপ্রাপ্ত): Snigdha was terribly shocked at the death of Ratul.
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Idioms
Lame excuse (বাজে ওজর): The lame excuse will not do.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Slow coach (অলস): You cannot expect much from a slow coach.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.