I first saw a graph similar to this one in a software magazine article.
我在一篇软件杂志的文章中第一次看到与此类似的图。
Edges in the graph represent flow of control from one statement (or block) to another.
图的弧边表示从一个语句(或块)到另一个语句或语句块的控制流。
The graph of a function one is just a horizontal plane at height one.
函数1的图像就是高度为1的水平面。
Clearly each plane graph has exactly one unbounded face.
显然，每个平面图都有一个无界面。
Clearly each plane graph has exactly one unbounded face.
显然，每个平面图都有一个无界面。
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