sonar amplifier

例句：

1. 1. The sonar system detected a submarine in the ocean.
   声纳系统在海洋中探测到了一艘潜艇。
2. 2. The sonar operator used the device to map out the underwater terrain.
   声纳操作员使用该设备来绘制水下地形图。
3. 3. The sonar was used to locate the lost ship.
   声纳被用来定位失踪的船只。