It only remains to replace each edge of this diagram by a suitable subgraph which bears the information previously given by the direction and colour.

剩下要做的事只是用适当的子图代替这个图解的每条边，使得原来用方向和颜色给出的信息由这个子图来担当。

youdao

It only remains to replace each edge of this diagram by a suitable subgraph which bears the information previously given by the direction and colour.

剩下要做的事只是用适当的子图代替这个图解的每条边，使得原来用方向和颜色给出的信息由这个子图来担当。

youdao