Trapezoidal no volume! It is a planar graph!
梯形没有体积！它是一个平面图形！
Most of the two-dimensional models that manage topology are based on the planar graph theory.
大多数操作拓扑结构的二维模型都是基于平面理论的。
Using this method can be based on signal spectral analysis method of fault diagnosis into a planar graph recognition.
利用该方法可以将基于信号频谱分析的故障诊断方法转化为平面图形的识别。
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