Rontgen rays : রঞ্জন রশ্মি;
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Appropriate Prepositions
Apply for(কারো কাছে আবেদন করা): Sumi applied to the Principal for free studentship.
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Free from (মুক্ত): He is now free from danger.
Look into (তদন্ত করা/অনুসন্ধান করা): I am looking into the matter.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Pin money (স্ত্রীর দেয়া হাত খরচ)— She saved her pin money.
Run short (কমতি পড়া) —I ran short of money.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
To the point (সঠিক) - The boy answered the question to the point.