Spectrometer : বর্ণালীমাপক; স্পেক্ত্রোমেত্রে;
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Appropriate Prepositions
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
Play on (বাজানো): They play on the piano.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
Regret for (দুঃখ করা): We regretted for his failure.
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Idioms
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Tide over (বিপদ অতিক্রম করা-overcome ): The manager tided over the situation.
Worthy of (যোগ্য) - He is worthy of a good job.