Cosmic rays : মহাজাগতিক রশ্মি;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Affectionate to(স্নেহশীল): He is very affectionate to his baby.
Quarrel over (কোন বিষয়ে ঝগড়া করা): Do not quarrel over this trifling matter, let it be drop.
Quick at (চটপটে): A cashier must be quick at figures.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.