如果你对咖啡因的作用特别敏感，那么即便是少量的咖啡因——比如一杯咖啡或是茶——就能导致一些不良效果，如焦虑、不安、易怒及睡眠问题等。

If you're susceptible to the effects of caffeine, just small amounts - even one cup of coffee or tea - may prompt unwanted effects, such as anxiety, restlessness, irritability and sleep problems.

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