Virologist : ভাইরাসবিদ;
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
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Idioms
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.