Urea : স্তন্যপায়ীদের মূত্রে প্রাপ্ত একধরনের বর্ণহীন কেলাসিত নাইট্রোজেন ঘটিত যৌগ; ইউরিয়া;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Conceal from(লুকানো) Do not conceal anything from me.
Dwell in (বাস করা): He dwells in a tall apartment.
Work with (কারো সাথে কাজ করা): They will be working with me on the new project.
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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 (comfortable— আরাম) He feels at home in Dhaka now.
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
For good (চিরদিনের জন্য): He left the house for good.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.