图1：迭代旅行终点之前的三个里程碑：圣达菲、巴吞鲁日和杰克逊。
Figure 1: Three milestones before the end of our iterative trip: Santa Fe, Baton Rouge, and Jackson.
你可以通过画三角形来做，我用圆圈来标记，从分布图的起始点到终点。
You can do it by drag triangles, which I have marked with circles, to the start and end points of the histogram.
实心圆表示活动图的起点，实际上是一个占位符，带边框的实心圆表示终点。
The filled circle represents the starting point of the activity diagram, effectively a placeholder, and the filled circle with a border represents the ending point.
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