如果不确定的话，就恢复默认设置。
保存和恢复用户配置或恢复默认设置的能力。
The ability to save and restore user configuration or to restore the default Settings.
首先它必须容易撤销，让用户改变颜色的对话框应该提供恢复默认设置的功能。
Above all, they must be easy to undo. A dialog box that lets users change colors should offer a function that returns everything to the factory Settings.
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