underwater TV水下电视underwateradj.在水中生长的；水下的adv.在水下underwater medicine水下医学underwater seismics水下地震勘探underwater ignition水下点火underwater velocity水下速度underwater position潜游姿势underwater TV image水下电视图像underwater ordnance水下武器装备underwater location水下定位underwater mechanic水下机械军士underwater aircraft水下航行器