It is a large natural laboratory in which evolution can be seen at work.

它是个巨大的天然实验室，在那里可以看到实际的的演变过程。

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In fact, it's one of the simplest demonstrations we have of evolution at work.

事实上，这是十分简单的示范工作进程。

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In fact, it's one of the simplest demonstrations we have of evolution at work.

事实上，这是十分简单的示范工作进程。

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