Critical angle : সংকট-কোণ;
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Appropriate Prepositions
Affection for(স্নেহ): She has a great affection for the child.
Assent to(সম্মতি দেওয়া): The President has assented to the bill.
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Look at (তাকানো): Students look at the blackboard.
Look up (ডিকশনারি থেকে শব্দার্থ খোঁজা): He is looking up a new word meaning from dictionary.
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Idioms
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
On the wane (হ্রাসমান): His fame is on the wane now.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.