And I want to spend a couple of minutes again reinforcing that. So if we look at that code and we were little more careful about this, what did we say to do? We said look an sorry.

内容了，我还要花几分钟,来强化下，所以,如果我们再仔细些看下代码，我们应该关注些什么？

麻省理工公开课 - 计算机科学及编程导论课程节选