Let's compare case 2 and 3, since this where some people seem to have gotten confused.

让我们来比较一下第二和第三种情况，因为不少人好像在这里有些困惑。

麻省理工公开课 - 化学原理课程节选

The maximum number of courses someone on this campus is shopping this week 3 not an outlier followed by closely 70,66,63 on down so that is quite a lot of shopping to do.

本周选课数目最多的同学,选了70门，66门和63门课,实在是不少3,不过这并不是一件异乎寻常事。

哈佛公开课 - 计算机科学课程节选