Room temperature : ঘরের স্বাভাবিক তাপমাত্রা;
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Appropriate Prepositions
By heart (মুখস্থ): Kamal learnt to poem by heart.
Careful of (সতর্ক): He is very careful of his fault.
Convenient to(সুবিধাজনক): The work is convenient to your nature.
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Lame excuse (বাজে ওজর): The lame excuse will not do.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.