multi-layered state machine

• 多层状态机

multi-layered state machine的用法和样例：

例句

1. In other words, a state containing a deep history pseudo state must not have any direct or indirect inner states which themselves have orthogonal regions.
   换句话说，一个包含有深历史伪状态的状态不能有任何直接或间接的内层状态带有正交区域。