Harmonic series : বিপরীত শ্রেণী; বিপরীত শ্রেণি;
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Appropriate Prepositions
Entrust to (কাউকে কোনো কিছু বিশ্বাস করে দেওয়া): He entrusted the thing to me.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Hard of (কানে খাটো বা কম শোনা): Ratan is a hard of hearing.
Indifferent to (উদাসীন): Everybody is indifferent to my problem.
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Idioms
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Cock and bull story (আষাঢ়ে গল্প): You must be ashamed of your cock and bull story.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.