Wavelengths : তরঙ্গদৈর্ঘ্য; মধ্যবর্তী ব্যবধান;
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Appropriate Prepositions
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Quarrel over (কোন বিষয়ে ঝগড়া করা): Do not quarrel over this trifling matter, let it be drop.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
Far and wide (সর্বত্র): His fame spread far and wide.
Of course (অবশ্যই): Of course, you know what that meant.
Run into debt (ঋণগ্রস্ত হওয়া)— He ran into debt.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.