The Backspace key is really an Undo function, albeit a special one.

退格键实际上是一个撤销功能，虽然它非常特殊。

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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。

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If more programs had modal Undo tools, users would soon adapt to them. They would even come to expect them the way they expect to find the Backspace key on word processors.

如果更多的程序有着模型化的撤销工具，用户会很快习惯它们，他们甚至会更加期望在其他软件中找到类似于字处理程序中的退格键工作方式。

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