Doppler : ধ্বনি, আলোক বা অন্যান্য তরঙ্গের উৎসের সঙ্গে পর্যবেক্ষকের দূরত্ব কমলে বা বাড়লে ঐ তরঙ্গের কম্পাঙ্কে যে আপাত বৃদ্ধি বা হ্রাস ঘটে;
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Appropriate Prepositions
Argue against (বিপক্ষে বলা): She argued against the bill.
Arrange for(ব্যবস্থা করা): We have arranged everything for our study tour.
Cause of(কারণ): Industry is the cause of your success.
Delighted at/with (আনন্দিত হওয়া): Sharmin was delighted at/with her husband’s promotion.
Deprived of (বঞ্চিত): He was deprived of education due to extreme poverty.
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Idioms
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Base born (নীচ বংশজাত, খারাপ জাত—adj.) He is a base born person; I cannot go along well with him.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
With a lavish hand (মুক্ত হস্তে)— Give away something with a lavish hand.