One lesson here is that no species should be fished to the point where the ecosystem is unbalanced. That conclusion hardly requires the fish-fed brain of Jeeves.

一个教训是，鱼种不能捕捞到使生态系统失衡的程度，这个结论不需要吃鱼的杰夫斯（万能管家）的大脑才能理解。

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Instead, each chapter USES one of the naturalist's other books as a point of departure for a meandering, but ultimately enlightening, natural-history lesson.

书中的每一章节都以达尔文另一部著作为出发点，对自然史加以讨论：虽然篇幅可能略显冗长，但最终却发人深省。

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