longboat

详细解释:n. (商船附载的)大艇

英语解释：

名词 longboat:

the largest boat carried by a merchant sailing vessel

详细解释：

long.boat

n.Nautical （名词）【航海】
The longest boat carried by a sailing ship, especially by a merchant ship.
大艇：船，尤指商船上携带的最大的小艇