来自《耶鲁大学开放课程：基础物理 第7集 第7集》

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  So quite often, in the past,
  因此在过去
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  whenever a theory is accepted,
  通常一个理论要被接受
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  it's because the consequences can be worked out
  它要能被解出来
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  and compared to the experiment.
  并且计算结果与实验结果相符
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  But you could be in a position
  但你可能陷入这样一种窘境
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  where you have the right theory and the right equations,
  你有正确的理论 有正确的方程
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  but you cannot solve them.
  但你就是解不来
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  Anyway, this one happens to be solvable.
  碰巧 这个方程是可解的
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  If I change the force law to 1/r to the 2.1,
  但如果定律中 r 的指数变成了 2.1
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  then it's a different story.
  那就完全不一样了
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  Anyway, so we want to solve it but we cannot do the ellipse;
  现在我们来解这个方程 但不能用椭圆
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  it's too hard.
  这太难了