bascule

名词 bascule:

1. a structure or device in which one end is counterbalanced by the other (on the principle of the seesaw)

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-