Optical glass : আলোকবিদ্যা-সংক্রান্ত;
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Appropriate Prepositions
Agree with(ব্যক্তির সাথে একমত হওয়া): I agree with you.
Ascend from (উপরে ওঠা): Rahim watched the mist ascending from the valley.
Composed of(তৈরী): This medicine is composed of vitamins and minerals.
Inquire for (দেখা করতে চাওয়া): He inquires for the manager.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
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Idioms
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
At a discount (অনাদৃত) Female education is no longer at a discount now.
Brown study (day dream-দিবাস্বপ্ন -n) The woman is absorbed in a brown study.
In the long run (পরিণামে): You will have to suffer in the long run.
Part and parcel (অবিচ্ছেদ্য অংশ): Education is part and parcel to build a civilized nation.