involute line

• 渐开线

involute line的用法和样例：

例句

1. The line of contact is longer and the contact ratio is bigger, the meshing stationarity is good.
   渐开线弧齿圆柱齿轮具有较长的齿面接触线和较大的啮合重合度，齿轮副啮合平稳性好。