Wavefront : যে তল বা পৃষ্ঠের অনেকগুলি বিন্দু একট নির্দিষ্ট সময়ে একটি তরঙ্গের দ্বারা সমানভাবে প্রভাবিত হয়;
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Appropriate Prepositions
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Dressed in (সজ্জিত, পরিহিত): The girl was dressed in silk.
Pleased with (সন্তুষ্ট): Shamim is pleased with all his employees.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Bear (a) grudge (bear hostility to— শত্রুতা বা বিদ্বেষ পোষন করা—V) We should not bear (a) grudge against our brethren.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.