a warship with a streamlined hull designed to operate completely submerged in the sea for long periods, equipped with an internal store of air and a periscope and typically armed with torpedoes and/or missiles 潜艇,潜水艇 ■a submersible craft of any kind 潜水器,深潜器 ■(N.Amer.)a submarine sandwich (北美)船型大三明治
adjective
existing, occurring, done, or used under the surface of the sea 水下的;水下发生的;海中的,海底的 submarine volcanic activity. 海底火山活动。