Zwitterion : ধন-আহিত ও ঋণ-আহিত অংশে বিভক্ত অণু বা আয়ন;
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Appropriate Prepositions
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Cope with(সামলানো বা পেরে উঠা): They cannot cope with the situation.
Deal in, with, out (ব্যবসা করা, ব্যবহার করা, বন্টন করা): The man deals in rice. He does not know how to deal with a customer. The Chairman dealt out the relief materials to the flood affected people.
Married to (বিবাহিত): Salma was married to a Govt. Officer.
Regret for (দুঃখ করা): We regretted for his failure.
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Idioms
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Gift of the gab (বাকপটুতা): An advocate should have the gift of the gab.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
Without fail (অবশ্যই) - You must attend the meeting without fail.