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.
该模型包括一些基本的过程以及简单的有向图，这些边框控制着从一个活动到下一活动的处理逻辑流程。
It models the basic process and only simple directed edges that control the flow of processing logic from one activity to the next.
下面的CSS样式删除了子菜单上的边框，设置活动的菜单项一直显示，并且设置非活动的菜单项，只在它们的父级菜单被鼠标经过时显示。
The following CSS removes the border on the second nav level, sets the active subnav to always display, and sets the inactive subnavs to display when their parents are hovered.
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