Wave guide : তড়িৎচম্বুক তরঙ্গের ধারক ও পরিবহনকারী ধাতুনল ইত্যাদি তরঙ্গ চালক;
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Appropriate Prepositions
Acquit of (অব্যাহতি দেয়া): The chief justice acquitted him of the charge of murder.
Adorn with(সাজানো/সজ্জিত করা): Adorn the car with flowers.
Plead for (ওকালতি করা): He pleads for justice.
Subject to (সাপেক্ষে): The man was appointed subject to the approval of the chairman.
Work with (কারো সাথে কাজ করা): They will be working with me on the new project.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.