A colorless, volatile liquid, C9H13N, used primarily as a central nervous system stimulant.

一种无色挥发性液体，C9H13N，主要用作中枢神经系统兴奋剂。

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Caffeine is a central nervous system stimulant that ACTS in many ways like other stimulant drugs such as amphetamines, waking you up and increasing your muscular activity.

咖啡能够通过多种作用刺激你的中枢神经系统，就像其他的药物一样(比如安非他命)让你清醒，增强活力。

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In fact, caffeine is so popular, it is considered the most common central nervous system stimulant consumed globally, with more than 80 percent of caffeine consumed through coffee drinking.

事实上，咖啡因非常普遍，它被认为是全球消费最常见的中枢系统兴奋物质，80%的咖啡因的摄入是通过喝咖啡。

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In fact, caffeine is so popular, it is considered the most common central nervous system stimulant consumed globally, with more than 80 percent of caffeine consumed through coffee drinking.

事实上，咖啡因非常普遍，它被认为是全球消费最常见的中枢系统兴奋物质，80%的咖啡因的摄入是通过喝咖啡。

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