然后，学习了如何添加订阅特性，这样当用户订阅的文档类别中添加了新文档时，我们就可以通过电子邮件通知他们。

Then, you learned how to add a subscription feature so we can notify our users by email when new documents are added to the document category to which they are subscribed.

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订阅请通过电子邮件，点击这里。

To subscribe via email click here.

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例如，当新文档添加到用户订阅的特定主题时，Team Room应用程序会通过电子邮件通知他们。

For example, our Team Room application notifies our users by email when new documents are added to specific subjects to which they've subscribed.

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