It turns out on a Linux system there's this command called "man" for manual page.

结果是在一个Linux系统中，这里有这样一个叫做“man“的命令,用来显示指南手册的。

哈佛公开课 - 计算机科学课程节选

It's a little more involved on a PC but it's all free, the software you can download, and Linux in similar operating systems generally come with a compiler or you run a simple command to get it.

在PC机上有点复杂，但是它是免费的，你一般下载的软件，类似Linux的操作系统等等通常都需要,一个编译器，或者你可以运行一些简单的指令来获取。

哈佛公开课 - 计算机科学课程节选

And this is now a program that's web based, it's SMS based, it's voice based and it used to be Linux based as you'll see in a couple of weeks and it's just a program thatlet's you click where you are, click where you wanna go and voila, here are the next several shuttles that you can take.

这个程序现在是可以用网络访问的，可以用SMS的，可以用语音访问的,而且它曾经是Linux下的程序,你们几周后就会看到，它是这么一个程序,你可以点击确认你现在的位置,然后点你想要去的位置,然后程序会返回给你你能做的班车。

哈佛公开课 - 计算机科学课程节选