跟随着贝格尔号做环球航行，达尔文开始思考地球上生命的演变。

As the Beagle sailed around the world, Darwin began to wonder how life had developed on earth.

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寻找地外生命的故事似乎又要惨淡收场，但一系列关于地球上生命的惊人发现告诉我们它们和人们一直以来的认为有所不同。

That would be a depressing end to the story of habitable zones, if not for a series of amazing findings that life on Earth is not what everyone thought it was.

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在当今这种对环境的普遍污染中，化学制品与辐射狼狈为奸，改变着地球的自然状态，也就是改变着地球上生命的自然状态。

In this now universal contamination of the environment, chemicals are the sinister partners of radiation in changing the very nature of the world — the very nature of its life.

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There's a short story by the science fiction writer Orson Scott Card, where the basic point of the story is that of all the life forms in the universe, we, here on Earth, are the only ones that are mortal.

科幻作家Orson，Scott，Card写了一个短故事，该故事的主旨是,在宇宙的所有生命形式中，我们，在地球上是唯一终有一死的生命。

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