tangency point

• 切点

tangency point的用法和样例：

例句

1. The tangency point is known as the pitch point.
   两节圆的切点成为节点。
2. The steamline curve ratio in the bucket of a spillway gradually changes in the flow direction, but the wall curve ratio changes in the point of contact of the bucket suddenly.
   溢流反弧段流线的曲率呈沿程变化，而反弧上下切点位置处边壁曲率却发生突变。