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。
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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