I'm going to set up an index, which is going to tell me where to look, starting at the first part of the list, right?

索引告诉我从哪里开始检索数组，对不对？,然后我会去记录下我做了多少次比较，这样我就能看到这个算法的工作量了？

麻省理工公开课 - 计算机科学及编程导论课程节选

And I can obviously do the other direction which is I can say skip to index 2 and all the remaining pieces. This lets me slice out, if you like, the front part or back part or a middle part of the tuple as I go along.

很明显我可以从索引2开始切片,所有剩下的元素，这可以让我2,如果你喜欢我这么说的话,取得元素的前面的或者后面的,或者中间的部分。

麻省理工公开课 - 计算机科学及编程导论课程节选