... quit the running/entered command (停止当前运行/输入的命令) undo previous action (撤销前一个命令) M-x revert-(空格或-)buffer RETURN(回车) ...
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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。
When the undo command is unavailable (dimmed), you cannot undo the previous action.
当撤销命令不可用时(变灰)，则不能撤销之前的操作。
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