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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在这个领域，最主观的选择是使用CDN(内容分发网络). CDN针对大型网站非常有效果。

The area that is the most subjective is Using a CDN (content delivery network). CDN's are more useful for larger sites.

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由内容分发网络(CDN)支持的更快的文件服务。

Serve files faster with content delivery network (CDN) support.

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