Curvilinear : বক্ররেখা-বেষ্টিত;
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Appropriate Prepositions
Call on(কারও সাথে দেখা করা): I called on him in his office.
Contribution to (অবদান): His invention made a major contribution to road safety.
Hard of (কানে খাটো বা কম শোনা): Ratan is a hard of hearing.
Regard for (সম্মান): Good boys have great regard for their teachers.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
At times (মাঝে মাঝে): He at times comes here.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
In black and white – (লিখিতভাবে) – Put forward your proposal in black and white.
Silver tongue (মিষ্টভাষী)- He is a man of silver tongue.