You can't, because the file was saved; there is no UNDO here, so the programmer would need to either recover the backup copy or retype it.
不能使用它，因为文件已被保存；此处没有UNDO命令，因此，程序员需要恢复备份或重新输入。
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。
We'd also like to copy git's 'reflog' idea so you can easily view or undo any changes you've made to any ripenv.
我们也希望能够复制git的reflog思想，所以你能够轻易地检视或者撤销任何你在ripenv中所作的更改。
WireframeSketcher has all the usual editor functionality such as copy&paste and an infinite undo-redo.
WireframeSketcher具有所有的习惯操作方法例如复制、粘贴以及无穷的撤销重做。
The biggest difference between versioning and other Undo systems is that the user must explicitly request the version—recording a copy or snapshot of the document.
历史版本和其他撤销系统之间的主要差别在于用户必须显式地调用历史版本，记录一个复制或者文档的快照。
The familiarity of undo, redo, copy and paste have changed the way we live as well as the value we place on content and creation itself.
我们对撤销、还原、复制、粘贴了如指掌，它们改变了我们的生活方式以及创作和内容本身的价值。
The familiarity of undo, redo, copy and paste have changed the way we live as well as the value we place on content and creation itself.
我们对撤销、还原、复制、粘贴了如指掌，它们改变了我们的生活方式以及创作和内容本身的价值。
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