LS And what very often happens if you do an LS in your account, to list your files, there's a whole lot of stuff in here at the moment -- and I don't have it here - but what you'll often see -- I'll just fake this demo -- is a file called core.

经常发生的是，如果你用你的账号做一个，来列出你的文件，此刻这里有一大堆元素,-它不在这里,但你们将经常看到--我将篡改这个演示-,是一个叫做core的文件。

哈佛公开课 - 计算机科学课程节选

But you can look at manuscripts of the early eleventh century and see people singing Ps and Ls and Os and Ms and things like that.

但是大家可以看看,十一世纪初的手稿,可以看到那时有人在唱P,以及L,O和M之类的

耶鲁公开课 - 聆听音乐课程节选