Marginal cost : উপান্ত ব্যায়;
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Appropriate Prepositions
Adorn with(সাজানো/সজ্জিত করা): Adorn the car with flowers.
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Competent for(যোগ্য): He is not competent for the post.
Depend upon (নিশ্চিত থাকা, আস্থা রাখা): Sumi depended upon his word.
Perfect for (সঠিক, মানানসই): The new book is perfect for you.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
On the wane (হ্রাসমান): His fame is on the wane now.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.
Set something right (ঠিক করা)— He will set the machine right.