Orthogonal : লম্ব; সমকোণীয়;
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Appropriate Prepositions
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Convenient to(সুবিধাজনক): The work is convenient to your nature.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Repent of (অনুতাপ করা): I repented of my past.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
ABC - (প্রাথমিক জ্ঞান): I don't know the ABC of politics.
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Three score (ষাট): He is happy as his brother got three score.