Tachometer : চক্রাকারে আবর্তনের গতিমাপক যঁত্র;
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Appropriate Prepositions
Abide in(বাস করা): I abide in Dhaka with my family.
Congenial to(উপযোগী): The atmosphere is congenial to your health.
Convert to(দীক্ষিত): Tom is converted to another religion.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Run into (জড়িয়ে পড়া): He had run into debt.
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Idioms
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.