Harmonic series : বিপরীত শ্রেণী; বিপরীত শ্রেণি;
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Appropriate Prepositions
Abhorrent to(ঘৃণ্য): Racism of any kind is abhorrent to me.
Ask about (কাউকে খোঁজ করা): Rahim asked about Karim.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Remedy for (প্রতিকার): There is no remedy for cancer.
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Idioms
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Fight shy of (এড়িয়ে যাওয়া): Honest boys always fight shy of bad and dishonest friends.
Out of order (বিকল): The elevator was out of order.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.