Marginal productivity : উপান্ত উৎপাদনক্ষমতা;
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Appropriate Prepositions
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.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
Regard for (সম্মান): Good boys have great regard for their teachers.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.