sonar equations

例句：

1. 1. The sonar system detected the submarine in the deep sea.
   声纳系统在深海中探测到了潜艇。
2. 2.The sonar operator used a microphone to listen to the underwater sound waves.
   声纳操作员使用麦克风来听水下声波。
3. 3.The sonar was used to map out the ocean floor and detect underwater objects.
   声纳被用来绘制海洋底部地图并探测水下物体。