渐屈线

例句：

1. 1. The engineer drew a diagram of the bridge's gradual curvature.
   工程师绘制了这座桥逐渐弯曲的示意图。
2. 2. The path follows a gentle arc, leading to the distant mountain range.
   这条路径沿着一条柔和的弧线延伸，通向远处的山脉。
3. 3. The car's steering wheel is designed with an ergonomic curve that makes driving comfortable.
   汽车的方向盘设计有人体工程学的曲线，使得驾驶舒适。