Wave length : তরঙ্গদৈর্ঘ্য; মধ্যবর্তী ব্যবধান; একটি তরঙ্গের চূড়া হইতে অন্য তরঙ্গের চূড়ার দূরত্ব;
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wave length  wavelength  wavelengths  See Words Also In
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Appropriate Prepositions
Attacked by(আক্রান্ত ব্যক্তিবাচক): He has been attacked by a gang of robbers.
Care of(যত্ন নেওয়া): You should take care of your health.
Consistent with(সামঞ্জস্যপূর্ণ): Your action is not consistent with your word.
Convenient to(সুবিধাজনক): The work is convenient to your nature.
Delighted at/with (আনন্দিত হওয়া): Sharmin was delighted at/with her husband’s promotion.
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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.
Liable to mislead (প্রতারণাপূর্ণ- deceptive): Appearances can often be liable to mislead.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
Three score (ষাট): He is happy as his brother got three score.