Extinction angle : কুণ্ঠন কোণ; লোপ-কোণ;
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Appropriate Prepositions
Antipathy to/towards (ঘৃনা): I have a strong antipathy to smoking.
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Regret for (দুঃখ করা): We regretted for his failure.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Up to (পর্যন্ত) - I have done the exercises up to page 40.