声波定位仪

例句：

1. 1. The sonar is used to locate underwater objects.
   声呐用于定位水下物体。
2. 2. The sonar system can detect the location of ships and aircraft.
   声纳系统可以探测船只和飞机的位置。
3. 3. The sonar operator carefully listens to the sound waves for accurate readings.
   声纳操作员仔细倾听声波以获取准确的读数。