Wavelengths : তরঙ্গদৈর্ঘ্য; মধ্যবর্তী ব্যবধান;
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Appropriate Prepositions
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Concerned with(জড়িত): She was concerned with such things.
Count for(গণ্য বা বিবেচিত হওয়া): There can be no lasting peace without true democracy in which the people play a part and count for something.
Repentance for (অনুতাপ): He has repentance for the past.
Run into (জড়িয়ে পড়া): He had run into debt.
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Idioms
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
In the long run (পরিণামে): You will have to suffer in the long run.
Safe and sound (নিরাপদে)— He reached home safe and sound.