它包括添加和删除书签、检索用户书签列表和检索（或者重命名）用户标记的方法。
It includes methods to add and delete bookmarks, retrieve a user's bookmark list, and retrieve (or rename) a user's tags.
命令的扩展只包括添加其他步骤。
An extension of a command consists simply of adding an additional step.
首先它可以管理所有幻灯片，包括添加和删除幻灯片。
First, it must manage all slides, including adding and deleting slides.
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