U curve

例句：

1. 1. The geometry of the U curve is used in designing bridges.
   U曲线的几何形状被用于设计桥梁。
2. 2.In aerodynamics, the U curve is used to describe the shape of an object's wake.
   在气动学中，U曲线被用来描述物体尾迹的形状。
3. 3. The U curve is often used as a reference point for measuring distances and angles.
   U曲线经常被用作测量距离和角度的参考点。