英语语法分析

When the second knife face is designed to be a non-linear face, the second knife face can be an inner cavetto line or an outer cavetto line;

当第二刀面 设计成非线性面时，可以是内凹弧线或者是外凸弧线；

The transmission part is an involute gear, and the working part can adopt different working faces, such as a cylinder excircle face, a circular arc tooth or an involutes tooth gear top cavetto.

传动部分是渐开线齿轮，工作部分可采用不同的工作面，如圆柱外圆面或圆弧形齿或渐开线齿轮齿顶修圆。