Conservation of energy : শক্তির নিত্যতা;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Apply to (কারো কাছে আবেদন করা): He applied to the principal for free admission.
Bar to(বাধা): Poverty is not a bar to happiness.
Entrust to (কাউকে কোনো কিছু বিশ্বাস করে দেওয়া): He entrusted the thing to me.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
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Idioms
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
Bad names (গালমন্দ—n) He called the man bad names.
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Three score (ষাট): He is happy as his brother got three score.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.