sonar early warning

例句：

1. 2.
   军事上的
2. 3.
   比喻地
3. 1. The sonar system detected a submarine in the vicinity.
   声纳系统在附近发现了一艘潜艇。
4. 2. The sonar operator was able to locate the lost vessel using sound waves.
   声纳操作员利用声波找到了失踪的船只。
5. 3. The sonar expert had a keen ear for detecting underwater sounds.
   声纳专家对探测水下声音有敏锐的听觉。