Unsanitary : অস্বাস্থ্যকর; অশ্লীল; মলিন; নোংরা;
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Appropriate Prepositions
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Play on (বাজানো): They play on the piano.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
Far and wide (সর্বত্র): His fame spread far and wide.
Out of date (সেকেলে): This fashion is out of date.
Run high (বেড়ে যাওয়া) —The price of everything has run high.