Waveguide : তড়িৎচম্বুক তরঙ্গের ধারক ও পরিবহনকারী ধাতুনল ইত্যাদি তরঙ্গ চালক;
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Appropriate Prepositions
Adapt to(খাপ খাওয়ানো): Everybody must adopt himself to new environment.
Zeal for (উৎসাহ): Forhad has great zeal for cricket.
Argue with, about(কথা কাটাকাটি করা): They always argue with me about tiny matter.
Innocent of (নির্দোষ): The maid servant was proved innocent of the alleged theft.
Succeed in (সাফল্য লাভ করা): He succeeded in life.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
In the wake of (ঠিক পরে): Police came in the wake of the accident.
Pass sth/sb off as sth/sb (মিথ্যা পরিচয় দেয়া; Pretend – ভান করা): They were trying to pass off these shirts as genuine Armani.