Rectangular hyperbola : সমপরাবৃত্ত;
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Appropriate Prepositions
Absent from(অনুপস্থিত থাকা): I was absent from the class yesterday.
Appointment with (সাক্ষাতের সময়): He has an appointment with the minister at 10:00 am.
Call in(ডাকিয়া আনা): They called in a doctor.
Care of(যত্ন নেওয়া): You should take care of your health.
Hostile to (বিরোধী বা বিরূপ ভাবাপন্ন): Nobody is hostile to you.
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Idioms
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
On the whole (মোটের ওপর): On the whole, his conduct is good.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.