Ground glass : ঘষা কাচ;
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Care of(যত্ন নেওয়া): You should take care of your health.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
Subject to (সাপেক্ষে): The man was appointed subject to the approval of the chairman.
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Idioms
At times (মাঝে মাঝে): He at times comes here.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.
Scapegoat (উদোর পিন্ডি বুধোর ঘাড়ে)—He was made scapegoat of the incident.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.