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.

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再说一遍，iPhone并不是一台电脑，但是大多数的智能手机都有巨大的存储空间和强大的文件管理功能，这些功能都允许你储存文件或者发送文件。

Sure, the iPhone isn't a computer, but a smartphone with so many capabilities and a generous hard drive should at least allow storing and sending of files.

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数据库管理系统是一种能够管理存储在电脑文件夹中的数据的软件。

A database system is a software which can manage a database stored in computer files.

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