Rontgen rays : রঞ্জন রশ্মি;
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Appropriate Prepositions
Aware of(অবগত): I am not aware of his dishonesty.
Bark at(ঘেউ ঘেউ করা): The dog is barking at the strange woman.
Caution against(সাবধান): Take all cautions against the danger.
Consistent with(সামঞ্জস্যপূর্ণ): Your action is not consistent with your word.
Fed up with (বিরক্ত): He is fed up with waiting for her.
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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-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Round the clock (সমস্ত দিন): He is working round the clock.
Tooth and nail (strongly, প্রবলভাবে)-He fought tooth and nail against his enemy.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.