Rock crystal : স্ফটিকাবিশেষ; একপ্রকার স্বচ্ছ বর্ণহীন স্ফটিক; স্বচ্ছ কোয়ার্টস;
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Appropriate Prepositions
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Damage to (ক্ষতি): The flood caused much damage to crops last year.
Succeed in (সাফল্য লাভ করা): He succeeded in life.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Cut a sorry figure (খারাপ ফল করা): He cuts a sorry figure in the examination.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.