Rather than merely a sign, it is the root from which we can trace back to our ancestor, the tie that helps bind us to other members of the same clan, the dignity most people hope to live for.

它不仅仅是一种标志，更是我们可以追溯到祖先的根源，是将我们与同族其他成员联系在一起的纽带，是大多数人希望为之而活的尊严。

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But we can't trace these habits merely to the complexities of the human psyche, because it's not just humans who exhibit them.

但我们不能把这些习惯一股脑儿地归到人类心理的复杂性上面，因为表现出这些习惯的不只是人类。

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