Wave number : একক দৈর্ঘ্যের অন্তর্গত তরঙ্গসমূহের সংখ্যা;
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Appropriate Prepositions
Angry with(কারো সাথে ক্রুদ্ধ হওয়া): The teacher was very angry with the students.
Antipathy to/towards (ঘৃনা): I have a strong antipathy to smoking.
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Assent to(সম্মতি দেওয়া): The President has assented to the bill.
Worry about (কোনো কিছু বা কাউকে নিয়ে উদ্বিগ্ন হওয়া): Please, don’t worry about me. I will be alright.
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Idioms
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Stone’s throw (অতি নিকটে): Our school is at a stone’s throw from our house.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.