来自《耶鲁大学开放课程：基础物理 第13集 第13集》

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  and if you go and solve for t' in the other equation,
  如果你把另一个等式里的 t' 解出来
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  it's a simple algebraic manipulation,
  就是简单的代数变换
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  so I don't want to waste my time doing that.
  所以我不想浪费时间来做这个
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  You will find
  你们会发现
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  t'=t-u·x/c^2 divided by the same square root.
  t'=t-u·x/c^2 除以同样的平方根
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  These are priceless. This is really all of relativity,
  这两个式子非常重要 是相对论的精髓
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  all the funny stuff you hear about E=M·c^2,
  关乎所有你听说的 E=M·c^2
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  funny clocks, the Twin Paradox.
  钟慢效应啊 孪生子佯谬啊
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  Everything comes from this equation.
  所有这些都来自这个方程
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  And you people should be very pleased that
  你们也应该感到十分欣慰
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  within, what, six weeks of starting Physics 200,
  因为在物理 200 这门课开始的六周里
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  you have all the things you need
  你们已经拥有所有需要的知识