爱意味着你关心一个人的幸福，也就是说你希望他或她能过上幸福的生活。

Love means you care about the welfare of a person, that is, you hope he or she can lead a happy life.

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如果是单身，你会在乎身边人的幸福吗？

If you are single, do you care about other people's happiness?

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选择通常直接关系到一个人的幸福。

Choices are often directly related to one's happiness.

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And very interesting for positive psychologists, those concerned with wellbeing and happiness: their wellbeing and happiness levels were incredibly similar.

让积极心理学学者，和研究幸福和快乐的人，更感兴趣的是：,这些双胞胎的幸福和快乐水平非常相似。

哈佛公开课 - 幸福课课程节选

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

耶鲁公开课 - 古希腊历史简介课程节选

And this leads to the principle of the greatest good for the greatest number.

从而引出“为最多的人谋求最大的幸福“这一原则。

耶鲁公开课 - 公正课程节选