Hydrodynamics : জল ও অন্য অন্যান্য তরল পদার্থসংক্রান্ত শক্তিবিজ্ঞান;
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Appropriate Prepositions
Born of(জন্মগ্রহণ করা): I was born of a middle class family.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Hatred for (ঘৃণা): I have no hatred for anyone.
Noted for (বিখ্যাত): She is noted for dancing.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Cock and bull story (আষাঢ়ে গল্প): You must be ashamed of your cock and bull story.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Null and void (বাতিল): The deed has been null and void now.
To the point (সঠিক) - The boy answered the question to the point.