The cross section of the passage is a regular or irregular planepolygon, and then the specific surface area is large and the mass transfer efficiency is high.
通道横截面为规则或不规则平面多边形，因而比表面积大、传质效率高。
2
We have proposed an arithmetic of this kind to eliminate the vertex in a circling way, ignoring the knaggy character and the deasil or anticlockwise direction of the planepolygon.
In this article, the authors study the trimming of a random smooth curve in a planepolygon and present an arithmetic for it, with the conclusion drawn from the concept of traversing point.