Simple harmonic motion : সরল দোলন;
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Appropriate Prepositions
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
Desist from (বিরত থাকা): She desisted from making this.
Detrimental to (অপকারী): Smoking is detrimental to health.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
With a view to (উদ্দেশ্য): I went to hospital with a view to seeing you.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
Pass sth/sb off as sth/sb (মিথ্যা পরিচয় দেয়া; Pretend – ভান করা): They were trying to pass off these shirts as genuine Armani.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.