Optical glass : আলোকবিদ্যা-সংক্রান্ত;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Care for(গ্রাহ্য করা): I do not care for you.
Look into (তদন্ত করা/অনুসন্ধান করা): I am looking into the matter.
Look up (ডিকশনারি থেকে শব্দার্থ খোঁজা): He is looking up a new word meaning from dictionary.
Run over (চাপা পড়া): The man was run over by a truck.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
All along - (সব সময়): I was present in the meeting all along.
Hush money (ঘুষ): He offered a hush money to disclose the file.
Out of temper (ক্রুদ্ধ): The teacher is out temper to see the overall results.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.