来自《耶鲁大学开放课程：基础物理 第13集 第13集》

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  regardless of their mechanism,
  所有的表都会做同样的事
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  and that includes biological clocks.
  这也包括生物钟
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  So if you have a clock which is just yourself,
  如果你自己就算一块表
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  I look at you, you know, over 15 or 20 years I notice some changes.
  我看了你 15 或 20 年 我会注意到些变化
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  You become taller, then your hair turns white, your teeth fall off.
  你长高了 头发白了 牙齿掉了
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  That's a clock and that clock should also slow down.
  那也是表 它也会变慢
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  I don't care how your life systems work but you are a clock
  无论你生活习惯如何 你也是块表
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  and you've got to slow down.
  你也不得不慢下来
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  That's why you can make predictions about
  这是为什么人们可以预测
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  what happens to living systems
  身体状况的变化
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  even though that's not our main business.
  不过这不是我们主要讨论的问题
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  So, in particular, if you take a clock,
  现在假设你有一块特别的手表