由于所有的本能行为都有进化优势，否则就不会被留传下来了达百万年之久，很可能吃些脏东西也能帮助我们作为一个物种生存下来。
Since all instinctive behaviors have an evolutionary advantage or they would not have been retained for millions of years, chances are that this one too has helped us survive as a species.
像斯密改善产品设计论一样，这些进化已经不再使单个的老鹰具有相对优势，但它们的最终结果却使得老鹰作为一个物种而变得更有生命力。
Like Smith's product design improvements, these mutations no longer confer relative advantage to individual hawks, but their ultimate effect was to make hawks more effective as a species.
人类比大多数物种幸运，他具备超前思考，未雨绸缪的优势。
But humankind is luckier than most species. It has the advantage of being able to think ahead, and to prepare for the changes to come.
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