来自《耶鲁大学开放课程：基础物理 第4集 第4集》

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  Everything I did last time was 1D.
  我前面所做的都是一维的
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  You're pulling something, you're pushing something.
  你拉某个物体 或者推某个物体
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  you got one block connected to a second block to a third block
  你将一块连到另一块上 再连到第三块上
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  and you pull it.
  然后拉动它
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  We're done all that.
  我们已经都研究过了
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  So we're going to elevate this to high dimensions.
  我们要放到多维体系进行研究
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  And as you know, in high dimensions, acceleration is a vector,
  众所周知 在多维中 加速度是个矢量
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  and so force better be a vector
  所以力也应该是矢量
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  because when you take a vector and multiply it by a number
  因为当你把一个矢量乘以一个数的时候
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  you get something else.
  你得到了另一个矢量
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  And there, by that process, you've gone to higher dimensions.
  按这种方式 我们就进入了更高的维度
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  So let's take again simple problems
  我们一起再从简单的问题开始