来自《耶鲁大学开放课程：基础物理 第13集 第13集》

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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
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  which is made up of mechanical parts and human being,
  由机器零件和人身体组成的
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  and they travel at high speeds,
  它们以高速移动着
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  the aging of the human being should slow down
  人的衰老终会变慢
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  just like the clock's ticking will slow it down,
  就像钟表走动会慢下来一样
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  without knowing the reasons for it.
  尽管我们不了解其原因
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  So this leads to a very famous paradox called
  这个例子引申出了一个非常有名的悖论
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  the Twin Paradox. The Twin Paradox says that
  名为孪生子佯谬 这个悖论说的是
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  you've got two guys, twins.
  假设有两个人是双胞胎
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  Now, this is actually a valid example.
  这个例子是符合逻辑的
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  They were born at the same time, same place,
  他们在同一时间同一地点出生