Orthogonal projection : লম্ব-অভিক্ষেপ;
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Appropriate Prepositions
Associate with, in(জড়িত হওয়া): This man was associated with crime.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Charge with(অভিযুক্ত করা): He is charged with killing.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Loyal to (অনুগত): Every citizen must be loyal to the state.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Bear in mind (remember— মনে রাখা —V): You should also bear in mind the additional costs of the mortgage.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.