User agents will always know to look for it there.

用户代理总是会知道到那里去查找该文件。

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While other user agents and content types were supported, there was an implication that they were not as important.

尽管其他的用户代理和内容类型也得到了支持，隐含的想法是它们并非同等的重要。

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The interesting part is that the XHTML specification says that user agents "should" make this link available somehow.

最有意思的是，XHTML规范指出，用户代理“应该”以某种方式支持这种链接。

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In essence, it sets up a third- and a fourth-party that are agents for the end-user and site, respectively.

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Twitter agents will be working alongside the producers and Facebook and Tumblr will be commandeered by its user-fans.

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