Spectrometer : বর্ণালীমাপক; স্পেক্ত্রোমেত্রে;
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Appropriate Prepositions
Attentive to(মনোযোগী): He is attentive to his business.
Faithful to (বিশ্বস্ত): The dog is very faithful to its master.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
Yield to (নতি স্বীকার করা): I shall not yield to his temptation.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.