Snorkelling and diving的意思有什么区别?

Snorkel A breathing apparatus used by skin divers,consisting of a long tube held in the mouth。水下呼吸管：潜水员使用的由在口中置有一条长管组成的呼吸装置A retractable vertical tube in a submarine that contains air-intake and exhaust pipes for the engines and for ventilation,permitting extended periods of submergence at periscope depth。水下通气管：一种潜艇使用的可缩式垂直长管,装有供发机用的进排气管,使潜艇在潜望深度可延长在水底的潜水时间dive应该是带氧气瓶的潜水吧你可以查查那种英汉双解得词典