Equi-marginal utility : সমউপান্তিক উপযোগ;
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Appropriate Prepositions
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Crave for(আকাঙ্ক্ষা করা): Everyone craves for care.
Free from (মুক্ত): He is now free from danger.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Beggar description - (অবর্ণনীয় হওয়া): The distress of the Muslims in Bosnia beggars description.
In the wake of (ঠিক পরে): Police came in the wake of the accident.
Show good manner (ভালো আচরণ প্রদর্শন ): You should show good manner in the company of young ladies.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.