So, let's think about it, and let's think about what we're actually doing when we solve this.
确实更有效率的解决了问题,好,接下来让我们来想想,看我们实际上是怎么来解决这种问题的。
So you can think of it, if we were to just think of it as a straight line that we were going across, essentially what we're saying is that we're getting from point a to point c without ever getting through point b.
你们可以来想想看,如我我们把它想成是一条直线,我们要沿着这条线经过,这就是说我们要从a点,不经过b点而到c点。
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