xkcd

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XKCD中文站,一个关于浪漫、隐喻、数字、以及语言的线上漫画。

Solar System Model

中文翻译
Solar System Model
The Earth is, on average, located in the habitable zone, but at any given time it has a certain probability of being outside it, which is why life exists on Earth but is mortal.

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