On the other hand, am I likely to only search a list once? Probably not. There are going to be multiple elements I'm going to be looking for, so that suggests that in fact, I want to amortize the cost.

我可能就搜索一次么？,可能不是，可能我要找好多个元素,这样的情况下,我们就能分摊开销了，这告诉我们什么？这意味着。

麻省理工公开课 - 计算机科学及编程导论课程节选