Takes a start and an end point, just going to bind local variable names start and end to those pieces.

有一个开始和结束点，就是去把局部的变量的名字,和这些点进行绑定。

麻省理工公开课 - 计算机科学及编程导论课程节选

I declare a variable called n. I'm not giving it a value yet, so I had better be careful.

我申明一个变量n，我先不给它赋值，所以我最好小心点。

哈佛公开课 - 计算机科学课程节选