In our last program, we told you how the flow of immigration to the United States began to change in the eighteen eighties.

VOA: special.2010.05.20

We decrement so to speak the variable and then where will we go next in terms of the flow control, the flow of this program.

可以这么说，我们递减这个变量,然后按照控制流，即程序流进入到下一语句。

哈佛公开课 - 计算机科学课程节选