Standard deviation : ব্যত্যয় প্রমাপ;
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Appropriate Prepositions
Affection for(স্নেহ): She has a great affection for the child.
Attain to (লাভ করা): He will not attain to his objective so soon.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Congratulate on(অভিনন্দন জানানো): They congratulated me on my brilliant success.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
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Idioms
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
Run into debt (ঋণগ্রস্ত হওয়া)— He ran into debt.