气球状的圆圈代表状态，圆圈间的箭头线代表转移，它会被标以事件和动作。
Balloons represent states, and arrows between them represent transitions, which are labeled with events and actions.
气球状的圆圈代表状态，圆圈间的箭头线代表转移，它会被标以事件和动作。
Balloons represent states, and arrows between them represent transitions, which are labeled with events and actions.
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