underwater bed下游河床
underwateradj.在水中生长的;水下的adv.在水下
underwater coast slope水下岸坡
underwater propagation水下传输特性
underwater loudspeaker水下扬声器
Underwater Association水下技术协会
underwater performance水下作业
underwater oil storage水下储油
underwater wet welding水下湿法焊接技术
underwater manipulator水下机械手
underwater-to-ship潜对舰
underwater observation水下观测