刚孵出壳的小鸭子就会游泳，刚落地的羚羊就会站立、会跑，而呱呱坠地的人却不行，说明人在动物中原本是很脆弱的。人之所以脆弱，原因之一（撇开进化因素不说），因为只有两条腿；从生物学或物理学角度讲，要稳定地站立，得有三个以上的支点。而人又何以能后来居上成为万物之 The newly hatched ducklings swim, and the antelopes that have just landed stand, run and die, but those who are not born can not, suggesting that humans are very vulnerable in animals. One of the reasons why people are vulnerable (aside from evolutionary factors) is that there are only two legs. From a biological or physical standpoint, to stand steadily, there must be more than three fulcrums. And why people can eventually become all things