相反方向的

I've just had an inspiration; why don't we try turning it the other way!

我突然想出一个好主意—我们为什么不试反方转一转呢！

North and south are opposite directions.

北和南是反方。

A semicomplete multipartite digraph is obtained by replacing each edge of a complete multipartite graph by an arc or by a pair of two mutually opposite arcs.

摘要 用一条弧一对方反弧代替完全多部无图每一条边所有图被称为是半完全多部有图。