Zwitterion : ধন-আহিত ও ঋণ-আহিত অংশে বিভক্ত অণু বা আয়ন;
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Appropriate Prepositions
Abound with(ছেয়ে থাকা): They live in a region that abounds with oil.
Conscious of(সচেতন): I am conscious of my deficiencies.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Delighted at/with (আনন্দিত হওয়া): Sharmin was delighted at/with her husband’s promotion.
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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.
In the long run (পরিণামে): You will have to suffer in the long run.
Let loose (বল্গাহীনভাবে ছেড়ে দেয়া): He let his horse loose in the field.
Out of order (বিকল): The elevator was out of order.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.