Then next week we'll do more complicated problems that involve motion in higher dimensions, how to go to two dimensions or three dimensions.
下周我们将会处理更复杂的问题,包括更高维数的物体运动,如何处理二维以及三维运动
If you live in two dimensions or more, you've got to use vectors to describe most things.
如果你要考虑二维或二维以上的问题,大多数情况下需要用矢量来描述
That's the problem in two dimensions.
那是二维中的问题
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