来自《耶鲁大学开放课程：基础物理 第1集 第1集》

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  So, when I threw that thing up and you caught it,
  所以当你接住我抛出的物体时
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  what you are doing mentally
  你大脑里的反应就是
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  was immediately figuring out where it started and at what speed.
  立刻弄清它的初位置以及初速度
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  That was your initial data.
  这些就是你的初始数据
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  Then in your mind, without realizing it,
  在你脑海里 你会下意识地
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  you found the trajectory at all future times.
  想像出它之后的抛射轨迹
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  Now, there is one other celebrated formula that goes with this.
  与这种情况对应的还有一个著名的公式
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  I'm going to find that, then I'll give you an example.
  我会推导出来 之后再给你们举一个例子
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  Now, I'm fully aware that
  我很清楚
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  this is not the flashiest example in physics,
  这个并不是物理学中最经典的例子
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  but I'm not worried about that right now.
  但是这并是我现在的担心
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  You'll see enough things that will confound you,
  你将会发现很多物理问题会让你困扰