“这方面的例证不胜枚举，即便在生殖生物学里，自然方法也未必是最优和最有效的。”这就是报告的结论。

"There are many examples even in reproductive biology that the natural way is not necessarily the optimal or the most efficient one," they conclude.

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Donaldson博士及她的团队就是这么做的，他们的成果发表在《生殖生物学》12月刊上。

And that, as they describe in the December issue of Biology of Reproduction, is what Dr Donaldson and her team have done.

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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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