Isotherm : সমদ্বিবাহু ত্রিভুজ;
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isotherm  isothermal  See Words Also In
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Appropriate Prepositions
Charge with(অভিযুক্ত করা): He is charged with killing.
Delighted at/with (আনন্দিত হওয়া): Sharmin was delighted at/with her husband’s promotion.
Feed with (কোনো কিছু খাওয়া): They feed the cow with grass.
Perfect for (সঠিক, মানানসই): The new book is perfect for you.
Popte in, to (মার্জিত): We must be popte in our dealings. One should be popte to
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
In no time (শীঘ্র): He will finish the work in no time.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.