During the course of editing, undo, and redo, the model is the only thing that endures.
在编辑、撤销和重做的过程中，模型是唯一保持不变的。
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。
One huge improvement that makes SaaS feel more like a local desktop application is standard keyboard and mouse gestures for editing text, including cut, copy, paste, and undo.
使SaaS更像一个本地桌面应用程序的一个巨大改进是文本编辑时标准的键盘和鼠标操作，比如剪切、复制、粘贴和撤销。
What if he entered some text, edited it, and then decided to Undo the entry of that text but not Undo the editing of it?
如果用户想输入一些文本，编辑文本，接着决定撤销文本的输入。但不撤销对它的编辑，会怎么样？
What if he entered some text, edited it, and then decided to Undo the entry of that text but not Undo the editing of it?
如果用户想输入一些文本，编辑文本，接着决定撤销文本的输入。但不撤销对它的编辑，会怎么样？
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