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。