Mechanical advantage : যান্ত্রিক সুবিধা;
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Appropriate Prepositions
Agree with, on, to(একমত হওয়া): My father agreed with me on this point, but he did not agree to my proposal to set up a canteen.
Angry with(কারো সাথে ক্রুদ্ধ হওয়া): The teacher was very angry with the students.
Behave towards(ব্যবহার করা): The students behaved objectionably towards the Head teacher.
Convenient to(সুবিধাজনক): The work is convenient to your nature.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Scapegoat (উদোর পিন্ডি বুধোর ঘাড়ে)—He was made scapegoat of the incident.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.
With a lavish hand (মুক্ত হস্তে)— Give away something with a lavish hand.