A plane graph together with the set of faces it determines is called a plane map.

一个平面图与它所确定的面的集的总体称为一个平面地图。

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And, as Euler's successor, Carl Friedrich Gauss, was to discover, if you plot real numbers on one axis of a graph and imaginary ones on the other, you create a plane that represents both sorts of numbers.

ECONOMIST: Beno?t Mandelbrot