虽然你的个人电脑只能保存一个文件的一个副本，但像 Facebook 这样的大型服务项目，则会依赖于所谓的内容分发网络来管理数据和分发。

While your personal computer only keeps one copy of a file, large-scale services like Facebook rely on what are called content delivery networks to manage data and distribution.

youdao

在你做任何编辑之前，在某个位置保存一个文件备份。

Save a back up copy somewhere before you do any edits!

youdao

上载内容可能像如今在本地硬盘驱动器上保存一个文件那样简单，在某些情况下甚至更简单。

Uploading content will be as simple as saving a file on the local hard drive is today, and in some cases simpler.

youdao

And this is because as you start writing--saving files to your hard drive, what happens is you might save this file here, then this one, then this one, then this one, but very reasonably you might go back eventually and delete this one.

这是因为当你开始对硬盘驱动器进行读写时,你可以保存一个文件到磁盘的某处，然后再一个，再一个，又一个，最后你可能回到这,并删除这一个文件。

哈佛公开课 - 计算机科学课程节选

You write the source code, the stuff that looks like this and then you save your file, and now you just have a text file.

比如你们写出像这样的源代码后,保存，你将会得到一个文本文件。

哈佛公开课 - 计算机科学课程节选

But once you've written a program, "hello world," in a file called hello.c, you Save and Quit.

不过一旦你们写了一个“hello，world“程序“,并且把它保存为hello，c文件后退出。

哈佛公开课 - 计算机科学课程节选