这些化学物质共同作用，让肌肉紧张，消化系统减缓，血管收缩，心跳加速。
Together, they make the muscles tense up, the digestive tract slow down, blood vessels constrict and the heart beat faster.
这些化学物质共同作用，让肌肉紧张，消化系统减缓，血管收缩，心跳加速。
Together, they make the muscles tense up, the digestive tract slow down, blood vessels constrict and the heart beat faster.
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