The submarine dived just in time to avoid the enemy attack.潜艇及时下潜，刚好躲过了敌人的攻击。She dived down to the floor of the pool.她下潜到池底。The crew of the submarine prepared for a dive.潜艇上的全体船员准备下潜。The submarine submerged when enemy planes were sighted.潜艇发现敌机后马上下潜。