About one quarter of the presumed dead are still considered missing persons, never to be heard from again.

VOA: standard.2009.12.18

And if we had more time we could spell out rival theories of well-being, which could be interestingly distinguished one from another in terms of how they answer the question, ?" "What's missing from the experience machine?"

如果我们有更多的时间,我们可以谈谈幸福的各种理论，有意思的是，它们各不相同,他们对这个问题的答案不同，即“体验机器里缺少了什么“

耶鲁公开课 - 死亡课程节选

And if we had more time we could spell out rival theories of well-being, which could be interestingly distinguished one from another in terms of how they answer the question, ?" "What's missing from the experience machine?"

如果我们有更多的时间,我们可以谈谈幸福的各种理论，有意思的是，它们各不相同,他们对这个问题的答案不同，即“体验机器里缺少了什么“

耶鲁公开课 - 死亡课程节选