An open system, as the name describes, allows mass and energy to freely flow through the boundary.

开系，顾名思义，允许质量和能量自由地,流过它的边界。

麻省理工公开课 - 热力学与动力学课程节选

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