来自《耶鲁大学开放课程：基础物理 第13集 第13集》

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  There are two options open for you.
  你有两个方法可以选择
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  One is, these are simultaneous equations.
  一个是通过这些联立的方程
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  You've got to find a way to solve for x and t
  你能找到一种方法解出 x 和 t
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  in terms of x' and t' and
  写成 x' 和 t'
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  all these funny functions involving u.
  及这些有趣的包括 u 的函数的形式
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  You treat them all as constants and juggle them around,
  你把它们当作常数 把它们放一边
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  multiply by this, divide by that,
  乘以这 除以那
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  but you shouldn't do that
  但是你不用一步步这样计算
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  because you know what the answer should be.
  因为你清楚答案该是什么
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  The answer should be
  答案应该是
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  the same as what I got with the velocity reversed.
  与我得到的式子相同 只是符号相反
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  So, x should be x'+u·t' over the square root.
  所以 x 应该是 x'+u·t' 除以这个平方根