underwater bed下游河床
underwateradj.在水中生长的;水下的adv.在水下
underwater propulsion水下推进技术
underwater vegetation水下植被
underwater pelletizer水浸造粒机
underwater concreting水下灌注混凝土
underwater flare bomb水下照明弹
underwater technology水下技术
underwater projectile水下投射体
underwater bathymeter水下测探仪
underwater irradiance水下照度计
underwater protection水下防护