详细解释:n. 竖旋桥活动桁架
英语解释：
名词 bascule:
a structure or device in which one end is counterbalanced by the other (on the principle of the seesaw)详细解释：
bas.cule
n.（名词）A device or structure, such as a drawbridge, counterbalanced so that when one end is lowered the other is raised.平衡装置：一种装置或结构，比如吊桥，当一端末端降下时，另一边就升起，使保持平衡
来源：French [seesaw] 法语 [跷跷板] bas [low] from Medieval Latin bassus bas [低的] 源自 中世纪拉丁语 bassus cul [bottom] from Latin côlus [rump] * see (s)keu- cul [底部] 源自 拉丁语 côlus [鸟兽的臂部、尾梢] *参见 (s)keu-