Transforming an edge affects all connected vertices, faces and polygons.
改变一个边会影响到所有与之相联系的顶点、面、多边形。
Two vertices are said to be adjacent to one another if they are connected by a single edge.
如果两个顶点被同一条边连接，就称这两个顶点是邻接的。
In a graph, a vertex in a tree can be connected to any number of other vertices, provided that no cycles are created.
在图中，树的顶点可以连接任意数量的顶点，只要不存在环即可。
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