The author only needs to learn the elements that are specific to the topic type.
作者只需要学习针对该主题类型的元素。
You can search content by topic, and can browse by type.
可以根据主题搜索内容，然后根据类型浏览。
The first parameter, of type string, is the topic this message arrived on.
第一个参数为字符串类型，它是此消息的主题。
The mapping should start with topic, and finish with the current element type.
映射应该从主题开始，到当前元素类型结束。
Just type in the topic that interests you and join the chat.
只要键入你感兴趣的话题加入聊天。
Delete this help topic if your application support only one document type.
如果你的应用程序仅仅支持一种文档类型，删除先前的句子。
Delete this help topic if your application support only one document type.
如果你的应用程序仅仅支持一种文档类型，删除先前的句子。
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