And as they were past they see that a small child has fallen into the pond and is in danger drowning.

这时，你看到,一个小孩掉进了池塘,就要溺水，情况危急。

普林斯顿公开课 - 人性课程节选

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