Users and services can subscribe to the presence and capabilities of another user or group of users.

用户和服务可以订阅另一个用户或用户组的存在情况和功能。

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A third option, rather than using client side XSLT, is to detect the user agent at the server and to provide different content depending on the user agent's capabilities.

除了使用客户端XSLT之外，还有第三种选择，那就是在服务器检测用户代理，并根据用户代理的功能提供不同的内容。

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Communicate: match the presentation to the capabilities of the user.

表达：使用用户能力能够接受的表达方式。

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So let's go ahead and introduce a couple other capabilities so that we can finally start writing programs that maybe print out charts or interact with the user, play games, or the like.

让我们继续来介绍其他几个功能,以便我们最终能开始写程序,那样可以打印图表或与用户交互，打游戏之类的。

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