whaleback

详细解释:n. 鲸背状物, 鲸背甲板船

详细解释：

whale.back

n.Nautical （名词）【航海】
A steamship with the bow and upper deck rounded so as to shed water.
鲸背甲板船：一种蒸汽船，带有圆形的船头和上甲板以遮蔽雨水