Conservation of energy : শক্তির নিত্যতা;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Argue against (বিপক্ষে বলা): She argued against the bill.
Bark at(ঘেউ ঘেউ করা): The dog is barking at the strange woman.
Look into (তদন্ত করা/অনুসন্ধান করা): I am looking into the matter.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
All along - (সব সময়): I was present in the meeting all along.
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
Well off (স্বচ্ছল) - Jim and Della were not well off.