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Meaning of 咖啡因

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fēi yīn
caffeine (loanword)
Example Sentences
1
I gotta have some caffeine.
2
Chocolate has trace amounts of caffeine.
3
We each have our own thresholds for caffeine.
4
Caffeine is probably the most famous of the group.
5
So, what does caffeine do when it hits our system?