Rock crystal : স্ফটিকাবিশেষ; একপ্রকার স্বচ্ছ বর্ণহীন স্ফটিক; স্বচ্ছ কোয়ার্টস;
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Appropriate Prepositions
Attend on/upon (সেবা করা): We should attend on/upon the ailing patient.
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Succeed in (সাফল্য লাভ করা): He succeeded in life.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Bad names (গালমন্দ—n) He called the man bad names.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Without fail (অবশ্যই) - You must attend the meeting without fail.