Only one person at a time can work on a drawing, because it is editing a simple document.

同时只能由一个人进行绘图工作，因为这是在编辑简单的文档。

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It defines the various styles that are available in the editing session for the document in terms of font, pitch, decorations, spacing, TAB stops, and the like.

它定义了各种样式，这些样式可用于文档的字体、间距、修饰、间隔、制表符停止位等方面编辑会话。

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In editing systems it is usual to have an Undo command that makes the document revert to the state before the user's most recent changes.

在编辑系统中通常会有撤销命令来使文档回复到用户编辑之前的状态。

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Google's new service also works with third-party document creation and editing apps that are built to work with it.

WSJ: Google Drive Stores, Syncs, Edits in the Cloud