Dihedral angle : দ্বিতলকোণ;
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Appropriate Prepositions
Attain to (লাভ করা): He will not attain to his objective so soon.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Hunger for (আকাঙ্কা): The teacher has a great hunger for knowledge.
Pleased with (সন্তুষ্ট): Shamim is pleased with all his employees.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.