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caffeine
कैफीन / फुर्ती लाने वाला तत्व
a natural substance in coffee and tea that makes you feel more awake and energetic

“Karan avoids drinking tea late at night because the caffeine keeps him awake for hours.”
करन रात को देर से चाय पीने से बचता है क्योंकि कैफीन उसे घंटों तक जगाए रखती है।
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