displacement indicator

例句：

1. 1. The displacement indicator is used to measure the amount of movement in a system.
   位移指示器用于测量系统内的运动量。
2. 2. The displacement indicator showed that the car had been moved forward by 5 meters.
   位移指示器显示汽车已经向前移动了5米。
3. 3. The displacement indicator was used to detect the location of a hidden object.
   位移指示器被用来探测隐藏物品的位置。