In Saudi Arabia it takes five days. So,it's things like that where they can learn from each other about how to get more efficient, how to help entrepreneurs get off the ground."

VOA: special.2010.05.10

So that's where it's easy to get lost, but let's see if these lines in the picture help us stay on track.

这就是容易迷惑的地方，下面看看,这幅图中的这些线能否帮助我们追踪。

哈佛公开课 - 计算机科学课程节选