http://www.developer.com/design/article.php/2238131/State-Diagram-in-UML.htm
Transition: An arrow indicating the Object to transition from one
state to the other. The actual trigger event and action causing the
transition are written beside the arrow, separated by a slash.
Transitions that occur because the state completed an activity are
called "triggerless" transitions.
事件產生後且條件滿足 => 執行Action讓狀態移轉
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