Exchange ratio : বিনিময় অনুপাত;
Related Words
exchange greetings  exchange rate  exchange ratio  See Words Also In
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Appropriate Prepositions
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Entitled to (অধিকারী): He is entitled to a reward for honesty.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Hope for (আশা করা): Let us hope for the best.
Shout at (চিৎকার করে ডাকা): Do not shout at your parents.
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Idioms
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
In no time (শীঘ্র): He will finish the work in no time.
Man of letters (পন্ডিত ব্যক্তি): You are truly a man of letters.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.