Press the edges that stand upwards down, see arrows.
按向上的边站了下来,见箭头。
There are not hard and fast rules about this but most darts normally fold in towards the cf or cb. see arrows in figure13-10. press a way from cf.
关于这一点没有硬性的规定,但是大多数省道通常向前中心线或后中心线烫倒。
Similarly when you look at a UML diagram, then you see boxes and arrows, but they don't really tell you the meaning behind these relationships.
同理,当你看uml图时,你看到框框和箭头,但他们不会真正告诉你在这些关系下隐藏的意思。
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