科普小知识：为什么看到酸的食物就会流口水？ Advanced PREMIUM

Dialogue Vocab Review

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今天我们要跟大家介绍一个关于人体的有趣科普小知识。有时候当我们看到柠檬或想到酸酸的食物时，会忍不住流口水，你知道这是为什么吗？其实这个道理叫做条件反射，快来听听这堂课吧！

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