Plano-convex : সমোত্তল;
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plano-convex  planoconvex  See Words Also In
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
Inquire of, about, into, after (অনুসন্ধান করা): Roma inquired of me about my father’s health. The pope will inquire into the cause of fire. Mehjabin inquired after her friends.
Work with (কারো সাথে কাজ করা): They will be working with me on the new project.
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Idioms
Crying need (জরুরী): Mass education is a crying need for India.
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.
Speed money (ঘুষ; উৎকোচ): He hankers after speed money.
Without fail (অবশ্যই) - You must attend the meeting without fail.