Now again, don't get carried away, I almost didn't talk about this whole message-passing paradigm, but it's so pervasive in the world I felt you needed to hear about it.

现在我基本上没有讲过这种消息传递的实例，但是你们需要了解它所以我觉得你得好好听,但是他不是什么很深奥的概念,如果你不想考虑消息的概念。

麻省理工公开课 - 计算机科学及编程导论课程节选

It is true mathematically, you can add two numbers, but you've got to ask yourself,"What am I doing as a physicist when I add these two numbers?"

在数学上它是正确的,你可以引入这两个常数,但是你需要问问自己,当我引入这两个常数时,这么做有什么物理意义

耶鲁公开课 - 基础物理课程节选