关系箭头线在作业之中不清楚。
下面的示例绘制一端为箭头线帽、另一端为圆形线帽的线条。
The following example draws a line with an arrowhead at one end and a round cap at the other end.
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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