The phenomena is known as "emotional contagion, where if you're facing somebody, for instance, and they're they look at you in a face of absolute rage, it is very difficult to just sit there without your own face molding in accord to their own.

这种现象就是情绪感染，例如，你看着某人，他们怒气冲冲看着你，你很难只是坐在那里,不去回应他们的愤怒。

耶鲁公开课 - 心理学导论课程节选

So we now have a real usable criterion to help guide our understanding of whether things happen by themselves of their own accord or not.

所以我们找到了一个非常有用的判据,这个判据能够指导我们,弄明白变化是否,是自发发生的。

麻省理工公开课 - 热力学与动力学课程节选