Biconvex : দুই দিকে স্ফীত;
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Appropriate Prepositions
Arrive at(উপস্থিত হওয়া, পৌছানো): The train arrived at Dhaka station on time.
Ascend to (আরোহণ করা): karim began to ascend to the surface of wakefulness.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
Short of (অপর্যাপ্ত): I am running short of money.
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Idioms
At times (মাঝে মাঝে): He at times comes here.
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.