Quadratic : দ্বিঘাত; দ্বিশক্তি; সমচতুষ্কোণসংক্রান্ত; চতুষ্কোণতুল্য;
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Appropriate Prepositions
Caution against(সাবধান): Take all cautions against the danger.
Detrimental to (অপকারী): Smoking is detrimental to health.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.
Worthy of (যোগ্য) - He is worthy of a good job.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.