详细解释:n. 龙骨式艇
英语解释：
名词 keelboat:
river boat with a shallow draught and a keel but no sails; used to carry freight; moved by rowing or punting or towing详细解释：
keel.boat
n.Nautical （名词）【航海】 A riverboat with a keel but without sails, used for carrying freight.运货船：一种运货的河流用船，有龙骨但无帆