来自《耶鲁大学开放课程：基础物理 第1集 第1集》

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  there's more than the answers that you could imagine.
  有超出你想象的答案
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  Here it meant particle that was released from the ground earlier.
  这里我说的是先前从地面释放的质点
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  There it meant something much more interesting,
  而那里说的是一些更有趣的东西
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  mainly anti-particles accompanying particles.
  大多数反粒子与粒子成对出现
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  They are going to accompany particles
  他们是成对的粒子
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  surely as every quadratic equation has two solutions.
  正如每个二次方程都有两个根一样
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  So now in this problem,
  对于这个问题
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  we can do something slightly different,
  我们可以稍微做点变化
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  and let's use this expression here,and I will do that,
  让我们用这个式子 就是这样
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  then I'll stop for today.
  今天就讲到到这里
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  If you were asking questions,
  如果你想问
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  like, how high does it go,
  例如 它可以到多高