From a psychological point then, animals have evolved to be nice to their kin, particularly their children, and particularly in birds and mammals.

从心理学角度看，动物进化趋向于对自己的亲人有益，特别是自己的孩子，以鸟类和哺乳类为代表。

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And there is some evidence, though it's not particularly strong at this point, that these same intuitions show up in young children and in nonhuman primates like chimpanzees, capuchins, macaques and so on.

我们有证据证明这点，虽然现在不是特别明显，同样的直觉出现在小孩子身上,也出现在非人类灵长类身上,例如黑猩猩，僧帽猴，猕猴等等。

耶鲁公开课 - 心理学导论课程节选

And children are particularly susceptible to these.

儿童特别容易受到这些病毒的摧残

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Children are particularly influenced by the contagiousness of laughter, but just in general, if you hear somebody laughing, like the kids you saw before, it's the sort of thing that could easily make you laugh.

孩子特别容易,受笑声的感染，但普遍来说，如果你听到有人笑，像你们刚才看到的小孩子，这样的事物很容易引你大笑。

耶鲁公开课 - 心理学导论课程节选