movable bridge

• 活动桥,开合桥

movable bridge的用法和样例：

例句

1. An acoustical instrument consisting of a sounding box with one string and a movable bridge, used to study musical tones.
   测弦器一种由一个带有一根弦和可移动琴马的共鸣箱组成的不用电传音的乐器，用于细察音调