If you don't have the units, then if you say the answer is 19, then we don't know what it means.

如果没有的话,比如你的答案是十九,那我们就不知道这是什么意思

耶鲁公开课 - 基础物理课程节选

This is on purpose, because one of the things I hope you have learned to do this semester, is look up things you don't know, and figure out what they do. What they mean.

我举这个程序是有目的的，因为我希望你们这续期能学到,如何去查找你不知道的东西并，且弄懂它,们是干什么的，是什么意思。

麻省理工公开课 - 计算机科学及编程导论课程节选