If I wanted to use print as a variable name, how do I get the system to decide gee, do I want print as a value for something, or do I want print as a command?

如果我把print当做一个变量名，我如何让系统来决定，我是要把print当做一个命令来用呢，还是要把它当做一个变量名来用呢？

麻省理工公开课 - 计算机科学及编程导论课程节选

It turns out on a Linux system there's this command called "man" for manual page.

结果是在一个Linux系统中，这里有这样一个叫做“man“的命令,用来显示指南手册的。

哈佛公开课 - 计算机科学课程节选