为节省绘图时间，最好不用点虚线和虚点方格线。
For economy in drawing it is best to avoid pecked lines and diced filling .
leader 元素的 leader-pattern 属性默认是设置为点虚线。
The leader-pattern attribute of the leader element is set to dotted by default.
图中虚线行指出活动间的信息流，这一点我将在创建WSFL全局模型这一部分进行更深入的说明。
The dotted lines in the graph indicate the flow of information between activities, which is something that I will explain a bit more in depth once I get to the part about creating a WSFL global model.
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