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
Apply to (কারো কাছে আবেদন করা): He applied to the principal for free admission.
Crave for(আকাঙ্ক্ষা করা): Everyone craves for care.
Free from (মুক্ত): He is now free from danger.
Senior to (বয়সে বড়): He is senior to me by two years.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.