Drainage system : জলনির্গমন-প্রণালী;
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Appropriate Prepositions
Appeal to, for(কোন ব্যক্তির কাছে কোন কিছুর জন্য আবেদন করা): The flood affected people appealed to the President for reef.
Appetite for(ক্ষুধা): He has no appetite for food.
Attentive to(মনোযোগী): He is attentive to his business.
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Fed up with (বিরক্ত): He is fed up with waiting for her.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Set free (মুক্ত করা): The prisoners were set free.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.