Luminescence : আলোক বিকিরণ;
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Appropriate Prepositions
Admit into(প্রবেশ করতে দেওয়া): Only the selected people were admitted into the theater.
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Call in(ডাকিয়া আনা): They called in a doctor.
Desire for (আকাঙ্ক্ষা করা): He has no desire for money.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
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Idioms
Crying need (জরুরী): Mass education is a crying need for India.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Pack of lies (ডাঁহা মিথ্যা)—He told pack of lies to prove himself innocent.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Without fail (অবশ্যই) - You must attend the meeting without fail.