... IsChecked - 是否被选中 false - 通常的两状态。默认值 true - 有3个状态，分别为：true, false, null。也就是说 CheckBox.IsChecked 是 bool? 类型 ...
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尽管我们都喜欢往前走，但是返回来重新构建生成一个构建，或者变回成一个两良好的状态通常是十分有用的。
Although we all like moving forward, it is often useful to go back to reproduce a build or revert to a good known state.
这种表格短小精悍（通常一、两页），可以随时带上，在跟团队成员交谈时，可以用当前的状态进行更新。
The form is compact (usually one or two pages) that can be carried around and updated with current status as you talk to team members.
这两个状态都很特殊，因为它们只进行导航(它们通常以菜单或选项卡的形式出现，具体取决于UI的样式)。
Both of these states are special because they are nothing more than navigations (they usually show up as menus or tabs, depending on the style of UI).
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