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美国一位小学老师为了劝喻学生们勤洗手，自行在学校做了一个面包实验。结果发现接触过电脑和没洗手后触摸的面包，发霉情况非常严重。而用肥皂洗手后才触摸的面包却没有发霉，证明洗手的重要。

小学老师查乐丽在脸书分享整个实验过程，她首先准备5片白面包分别放在不同的保鲜袋内，第一片是放过手提电脑上，第二片是新鲜而没被触碰过，第三片是没有洗手后触摸，第四片是用肥皂和水彻底清洗双手后摸过的，最后一片则是使用酒精搓手液后触摸的。由于方包本身有加添防腐剂，需将5片面包摆放3至4星期后才可以看到结果。

结果相当惊人，放过手提电脑上的方包差不多全块都变成深灰色，而没有洗手后触摸的也发霉了，呈灰灰黄黄色。令人较意外的是，即使用酒精洗手后才触摸的面包都产生了细菌发霉，只有用肥皂洗手摸过的才能幸免。

查乐丽强调这只是一个小学的课堂实验，并不专业。实验中使用的只是普通肥皂，证明用肥皂洗手的重要性，不要用酒精搓手液取代，呼吁大众为健康着想就要勤洗手。

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