单词：tangency point
tangency point的用法和样例：
例句
- The tangency point is known as the pitch point.两节圆的切点成为节点。
- 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。
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