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.

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。

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One file describes the interface to your service, while the other file describes your implementation of it.

一个文件描述到您的服务的接口，而另一个文件描述这个接口的实现。

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While the file system implementation is anything but trivial, it's a great example of a scalable and extensible architecture.

尽管文件系统的实现并不复杂，但它是可伸缩和可扩展的体系结构的好例子。

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We mentioned that we watched a few minutes of The Lorax and while the file generally played smoothly, we noticed some isolated bits that seemed ever so slightly slowed-down.

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And unlike the earlier PMP-1000, music continues to play even while browsing the file manager to add new songs.

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He said that while an intelligence file may say a witness was a member of the IRA, it could not prove he was.

BBC: Derry Guildhall