【运输】潜水艇underwater vessel
水下施工防污涂料underwater applicable anti-fouling paint
【运输】水底排水机，船只 (船)underwater exhaust ship (vessel)
水下诱鱼灯underwater attracting fish lamp
水中医学underwater medicine
水下作业underwater performance
潜水呼吸器breathing apparatus for underwater swimming
水下运动underwater exercise