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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When you move file services from one server to another, users may forget to access the new server.

当您将一个文件服务从一台服务器移到另一台服务器时，用户可能会忘记访问新的服务器。

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The services file helps applications resolve service names to port numbers.

服务文件帮助应用程序将服务名称解析为端口号。

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The free version has no email capability, and the app doesn't support common file-transfer services like Dropbox or SugarSync.

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