Solid angle : অস্র; ঘনকোণ;
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sliding scale  solid angle  See Words Also In
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Appropriate Prepositions
Angry for (কোন কাজে রাগান্বিত হওয়া): Rahim was angry with me for my having done this.
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Bask in(রোদ পোহানো): The boys and girls are basking in the sun right now.
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Be all and end all (the ultimate out come- চরম পরিণতি—n) A loss of one million taka was the be all and end all of the projects.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.