Decontamination : বিশুদ্ধতা; পরিষ্করণ; পরিপাটিতা; পরিচ্ছন্নতা; সংক্রমণমোচন;
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decontaminating  decontamination  See Words Also In
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Appropriate Prepositions
Argue against (বিপক্ষে বলা): She argued against the bill.
Attend on/upon (সেবা করা): We should attend on/upon the ailing patient.
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Damage to (ক্ষতি): The flood caused much damage to crops last year.
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
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Idioms
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.