In general, good programming style says you put in comments that are going to be valuable in helping you as a reader understand what's going on inside of the code.

通常来说，优秀的编码风格意味着,你要放进去的注释,在帮助代码阅读者,理解代码内部,是怎么工作的。

麻省理工公开课 - 计算机科学及编程导论课程节选

It's words to you, or to the reader of the code, that are telling you what's going on inside of this code. OK?

注释是一些对你，或者对代码阅读者说的一些话，告诉你这段代码,是干什么的，对不对？

麻省理工公开课 - 计算机科学及编程导论课程节选