Effective force : ত্বরণ-বল;
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Appropriate Prepositions
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Independent of (স্বাধীন): They are independent of my health.
Inferior to (নীচু/হীন): He is inferior to his neighbor.
Refer to (সিদ্ধান্তের জন্য প্রেরণ করা): The matter was referred to the Chairman for a decision.
Repent of (অনুতাপ করা): I repented of my past.
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Idioms
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Pick a quarrel (ঝগড়া করা)—Do not pick a quarrel.
Tide over (বিপদ অতিক্রম করা-overcome ): The manager tided over the situation.