Conservation of energy : শক্তির নিত্যতা;
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Appropriate Prepositions
Adjacent to (সন্নিহিত): His house was adjacent to the bridge.
Argue with, about(কথা কাটাকাটি করা): They always argue with me about tiny matter.
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
Contemporary of (সমসাময়িক): William Wordsworth was a contemporary for greater efficiency.
Taste of (স্বাদ; অভিজ্ঞতা): They have had some taste of problems.
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Idioms
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
Sheet anchor (শেষ আশ্রয়; প্রধান অবলম্বন; আসল খুঁটি)— This small piece of land is his sheet anchor.