Orthogonal projection : লম্ব-অভিক্ষেপ;
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Appropriate Prepositions
Appointment with (সাক্ষাতের সময়): He has an appointment with the minister at 10:00 am.
Contrary to(বিপরীত, পরিপন্থী): Students should not act contrary to the rules of discipline.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
Similar to (সদৃশ): My T-shirt is similar to yours.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Bear (a) grudge (bear hostility to— শত্রুতা বা বিদ্বেষ পোষন করা—V) We should not bear (a) grudge against our brethren.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.