Mechanical advantage : যান্ত্রিক সুবিধা;
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Appropriate Prepositions
Assent to(সম্মতি দেওয়া): The President has assented to the bill.
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Cast aside (ছুঁড়ে ফেলা): As soon as they become rich they cast aside their poor friends.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Creep up (বৃদ্ধি পাওয়া): The prices of are creeping up day by day.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.