习惯用语hull down1.(作修饰语用)(船只)远在只见桅杆, 看不到船身的地方(因船身在地平线之下); (坦克等)隐蔽在能观察敌人并能向其射击的地方特殊用法algebraic hull1.代数包absolute convex hulls1.绝对凸包balloon hull1.气球壳bare hull1.裸船体boat hull1.船壳; 船体catamaran hull1.双船体, 双体船closed hull1.闭壳conventional hull1.常规船体evacuation hull1.浸取后的包壳false hull1.(潜艇)外壳,非耐压艇体glass fiberhull1.玻璃钢船体holomorphichull1.全纯包linearhull1.【数】线性凸包metal hull1.金属船身outer hull1.(船体)外壳paddy hull1.稻壳pressure hull1.耐压壳体rice hull1.稻壳riveted hull1.铆合车盘; 铆接船体rubberized canvas hull1.橡皮壳seaplane hull1.水上飞机船身tanker hull1.油槽船船身