The toxic substances that fear, anger, frustration and stress produce not only kill guinea pigs but kill us off in a similar manner.

恐惧、愤怒、沮丧和压力产生的有毒物质不仅会杀死豚鼠，还会以类似的方式杀死我们。

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Two guinea pigs then tested them in real zero-gravity conditions. The results were videotaped but are considered so sensitive that even Nasa was only given a censored version.

他说“两只小白鼠最后在真实的零重力条件下做了试验，并拍成了录像，但是考虑到非常敏感，美国宇航局只提供了剪辑版。”

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But that does not mean that parents have an obligation to use their children as guinea-pigs in an experiment doomed to failure.

但这并不意味着家长们有义务把他们的孩子当作实验室里天竺鼠一样，去进行一项注定要失败的试验。

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"Initially they thought they were guinea-pigs but they quickly realised that in fact they were pioneers, " said Mr Cleaver.

BBC: Switchover lessons to be learned