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.
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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