对于每个活动，还可能会显示二级选项卡行，反映一个主活动中存在多个功能或步骤。
Within each activity, a second row of tabs might also display, reflecting multiple functions or steps within one main activity.
这个类将通过用例情节串连板(看下一点)中的主屏幕被典型地反映出来。
This class will typically be mirrored by a main screen in the use case storyboard (see next point).
每次更改应用程序的代码或数据，以及构建好一个新rpm时，一定要增加主版本和次版本的值，以分别反映主要和次要的更改。
Each time you change your application's code or data and make a new RPM available, be sure to increment the values of Version and Release to reflect major and minor changes, respectively.
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