The cross section of the passage is a regular or irregular plane polygon, 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。
In this article, the authors study the trimming of a random smooth curve in a plane polygon and present an arithmetic for it, with the conclusion drawn from the concept of traversing point.
研究了平面任意封闭区域对平面任意光滑曲线的裁剪，提出光滑曲线对封闭区域的穿越点概念，并以穿越点为依据，给出了平面任意封闭区域对光滑曲线的裁剪算法。
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