Preventive : নিবারক, প্রতিষেধক;
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Appropriate Prepositions
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Detrimental to (অপকারী): Smoking is detrimental to health.
Enter into (আলোচনা করতে আরম্ভ করা): Let’s not enter into details at this stage.
Run over (চাপা পড়া): The man was run over by a truck.
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Idioms
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.