Wave guide : তড়িৎচম্বুক তরঙ্গের ধারক ও পরিবহনকারী ধাতুনল ইত্যাদি তরঙ্গ চালক;
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Appropriate Prepositions
Business with (ব্যবসা, কাজ): He is pleased to do business with you.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Devoted to (মনোযোগী): He is devoted to music.
Regard for (সম্মান): Good boys have great regard for their teachers.
Work with (কারো সাথে কাজ করা): They will be working with me on the new project.
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Idioms
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
For good (চিরদিনের জন্য): He left the house for good.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.