Waveguide : তড়িৎচম্বুক তরঙ্গের ধারক ও পরিবহনকারী ধাতুনল ইত্যাদি তরঙ্গ চালক;
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Appropriate Prepositions
Argue over (কোন বিষয়ে তর্ক করা): The kids are arguing over which TV program to watch.
Arrive at(উপস্থিত হওয়া, পৌছানো): The train arrived at Dhaka station on time.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Look at (তাকানো): Students look at the blackboard.
Repentance for (অনুতাপ): He has repentance for the past.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
At a discount (অনাদৃত) Female education is no longer at a discount now.
Cock and bull story (আষাঢ়ে গল্প): You must be ashamed of your cock and bull story.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
On the whole (মোটের ওপর): On the whole, his conduct is good.