4.3 gopl.io/ch/graph中对于hasEdge函数的描述 #76
Description
译文为：“addEdge函数显示了如何让map的零值也能正常工作”。
英文原文为：The hasEdge function shows how the zero value of a missing map entry is often put to work
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译文为：“addEdge函数显示了如何让map的零值也能正常工作”。
英文原文为：The hasEdge function shows how the zero value of a missing map entry is often put to work