双开的英文：
bipartition

A complete bipartite graph is a simple bipartite graph with bipartition
完全偶图是具有二分类的简单偶图。

A bipartite agreement,treaty, etc
双边协定、条约等.

A graph is bipartite if it does not contain an odd cycle
一个图是二部图，如果它不包含奇圈。

If enough edges have been drawn to make the figure connected the graph is called bipartite
如果有足够的线使图连通，这图称为双图。