ctrl-z undo 撤销
You can undo a change by pressing Ctrl + Z. Multiple levels of undo are supported.
您可以通过按住Ctrl + Z键取消一个变更，并且支持多个步骤的取消操作。
If you make a mistake, you can use the usual keyboard shortcuts -- ctrl+z will undo your previous action while the backspace key will remove the element from the page.
假如您不小心写错或者画错了某些东东，您可以用常见的ctrl+z快捷键来撤销先前的操作步骤；用退格键可以移去您在页面上所作的注释。
If a rename operation goes horribly wrong - just undo it with CTRL-Z!
如果重命名操作出现可怕的错误—请使用CTRL - z组合键撤消它！
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