详细解释:n. 干舷
【化】 自由空间; 分离空间
详细解释：
free.board
n.（名词）Nautical The distance between the water line and the uppermost full deck of a ship.【航海】 出水高度：船的吃水线与最高层甲板之间的距离The distance between the ground and the undercarriage of an automobile.离地间隙：从地面到汽车底架之间的空间
来源：Probably ultimately partial translation of Anglo-Norman franc bord [land claimed outside the fence of a park or forest] 可能最终为 英法语 franc bord的部分翻译 [索取的公园或森林的边界之外的土地] franc [free] franc [自由的] bord [border] bord [边界]