Under a microscope, it resembles a stylized Navaho rug or the aerial view of a railroad switchingyard.
在显微镜下看起来，它就像一幅繁花似锦的那伐鹤地毯，或是一幅铁路调车场的鸟瞰图。
2
A switching function method is proposed in this paper to describe the network of railway yard and construct a switching network model of geographical circuitry.