下面是一个文献中看到的概念,请帮忙翻译一下呀,尤其是"orientation reversal"怎么翻译,什么意思啊?多谢!
twisted saddle loops: An orientation reversal along a homoclinic orbit may occur in systems whose dimension is larger than two. A generic homoclinic orbit is in a two dimensional ribbon which is invariant under the flow with tangents in the directions of the weakest contraction and expansion at the saddle point. A twisted saddle loop occurs if this ribbon is not orientable.