bascule
/ˈbæskjuːl/(亦作bascule bridge)
noun
1- 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。
1.1
- a movable section of road forming part of such a bridge竖旋桥的活动桁架。
词源
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'.