曲线

例句：

1. 1. The car's trajectory is being monitored by the radar system.
   汽车的轨迹正在被雷达系统监测。
2. 2. The path of the river follows a gentle curve through the valley.
   河流的路径在山谷中沿着一个柔和的曲线蜿蜒。
3. 3. The engineer drew a sketch of the bridge's curved shape.
   工程师绘制了桥梁弯曲形状的草图。