So, when you go to two dimensions, you need a pair of numbers.
因此在二维空间里,你需要一对数字来描述
But this is the way to do it in two dimensions.
但这也是在二维空间里的方法
But, you know, in 2D, the options are not just left and right or north and south, but infinity of possible directions in which I could go those 5 km.
但在二维空间中,不仅可以向左向右或者向南向北,我在走那5公里的时候可以有无数个方向
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