As seen here, some sapphires, when cut to a convex shape, exhibit a striking six-pointed star in direct sunlight.
正如我们所见，被切割成凸镜状蓝宝石会在阳光直射下呈现出一个六角星。
This paper first studies the graphic outer and inner cut by convex polygon, then the graphic cut by arbitrary polygon. Its application of compiler program proves to be satisfactory.
本文首先讨论了凸多边形对图形的外裁剪和内裁剪，在此基础上研究了任意多边形对图形的裁剪问题，通过编程应用，效果良好。
The main knife-edge area is a convex strip-shaped cutting belt, and is used to cut into sheets and threads;
主刀口区是呈凸弧狭条形切割带，用于切片切丝；
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