underwater bed下游河床
underwateradj.在水中生长的;水下的adv.在水下
underwater breathing水下呼吸
underwater operation水下作业
underwater benchmark水下基准
underwater fire pump水下消防泵
underwater ballistic水下弹道
Underwater TV system水下电视系统
underwater electrode水下焊条
underwater sand body水下砂体
underwater wrestling水底角力
underwater bulldozer水下推土机