profile curve

例句：

1. 1. The engineer drew a profile curve on the sketch.
   工程师在草图上画了一条轮廓曲线。
2. 2. The profile curve of the mountain is quite steep.
   这座山的轮廓曲线相当陡峭。
3. 3. The profile curve of the river shows the direction of the current.
   河流的轮廓曲线显示了水流的方向。