来自《耶鲁大学开放课程—哲学：死亡 第17集 第17集》

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  just how many potential people there are.
  知道会有多少潜在的人类
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  Let's start modestly and ask:
  先做一个保守估计
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  How many possible people could we,
  我们这一代人
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  the current generation, produce?
  可以制造多少人类
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  Now as I say, I made this calculation some years ago.
  我说过 几年前我做过这项计算
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  It doesn't really matter how inaccurate it's going to be.
  结果是否精确并不重要
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  As we'll see,
  我们会看到
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  it's very rough,
  这项估算很粗略
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  but it makes the point.
  但却能指出大致情况
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  How many people are there?
  会有多少人类
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  How many possible people, rather, could there be?
  或者说 可能产生多少潜在的人类
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  Well, suppose there were 5 billion people.
  假设现在有五十亿人口