a type of bridge with a section which can be raised and lowered using counterweights (其中一部分可以升降的)竖旋桥 ■a movable section of road forming part of such a bridge 竖旋桥的活动桁架
语源
late 19th cent.: earlier denoting a lever apparatus of which one end is raised while the other is lowered, from French (earlier bacule), 'see-saw', from battre 'to bump' + cul 'buttocks'