Extinction angle : কুণ্ঠন কোণ; লোপ-কোণ;
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Appropriate Prepositions
Add to (বৃদ্ধি করা, যোগ করা): The doll-dance in the exhibition added to our pleasure.
Aware of(অবগত): I am not aware of his dishonesty.
Bar to(বাধা): Poverty is not a bar to happiness.
Consistent with(সামঞ্জস্যপূর্ণ): Your action is not consistent with your word.
Die by (দূর্ঘটনা বা অপঘাতে মরা/কোন কিছু দ্বারা মারা যাওয়া): He died by a road accident.
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Idioms
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.