Critical angle : সংকট-কোণ;
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Appropriate Prepositions
Adjacent to(সংলগ্ন): The Post Office is adjacent to my house.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Effect of (প্রভাব): The effect of corruption is very harmful for our society.
Refer to (সিদ্ধান্তের জন্য প্রেরণ করা): The matter was referred to the Chairman for a decision.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Far and wide (সর্বত্র): His fame spread far and wide.
On the wane (হ্রাসমান): His fame is on the wane now.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Set free (মুক্ত করা): The prisoners were set free.