然而，后一个问题，生物学已经有了几种解释，它们都以长寿命与生殖能力的平衡为中心。

For the latter, though, biology has several explanations, all of which revolve around a trade-off between longevity and the ability to reproduce.

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这个现象表明对人类寿命差异的解释也许根植于我们的生物学中。

This phenomenon suggests that the explanation for the difference within humans might lie deep in our biology.

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这项新的研究发表在《公共科学图书馆·生物学》上，在该研究中，产生更多自由基的蠕虫或者服用了促进产生自由基的除草剂的蠕虫竟然比普通蠕虫的寿命长。

In the new study published in PLoS Biology, worms that made more free radicals or that were treated with a free-radical-producing herbicide actually lived longer than normal worms.

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