underwater gun水下枪械underwateradj.在水中生长的；水下的adv.在水下underwater explosion bubble水下爆炸气泡underwater bearing platform水下承台underwater sound transducer水声换能器underwater irradiance meter水下辐射度计underwater dry cabin system水下干式舱系统underwater acoustic network水声网络underwater target searching水下目标搜索underwater acoustic signals水声信号underwater listening device水声设备underwater target detection水下目标检测

1. I awoke to the sound of running water in the bathroom.
   我醒来的时候听到浴室里有水流动的声音。
2. They like to duck each other's head underwater in the pool.
   他们喜欢在游泳池里把对方的头往水里按。