What I mean by this is it's possible, of course, to be afraid of a person, but unlike an emotion like gratitude, it's not intrinsically social.

我这么说是想表明这是可能得，当然，人害怕时，不像感激时，不是社会固有的。

耶鲁公开课 - 心理学导论课程节选

I think it's a matter of, as a cyclist, being cautious, but also not being afraid.

我想作为一个骑自行车的人，这是自己小心的问题，但是也不必害怕。

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These are natural fears.

这是本能的害怕。

耶鲁公开课 - 心理学导论课程节选