And obviously, that ought to involve the variable in some way, or it's not going to make a lot of sense, so this includes the variable, since that's the thing that's changing.

很明显，这跟计数器的变量有某种关系,否则的话就没多大意义了,因此这跟计数器有关，因为它正是每次循环改变的东西。

麻省理工公开课 - 计算机科学及编程导论课程节选