A man who is living in a polis not doing well, how can he be happy? There's just no way.

一个生活在城邦里的人没有做好本分,他怎么会幸福,这是不可能的事情

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And he's not really very happy as opposed to a smile like this, which is a real smile.

他并不是很高兴,相反的是这样的微笑，这是真正的微笑。

耶鲁公开课 - 心理学导论课程节选