true motion indicator

例句：

1. 1.The true motion indicator is used to measure the rotation of a rotating object.
   真动指示器用于测量旋转物体的旋转。
2. 2.The true motion indicator was designed to detect and prevent accidents on highways.
   真动指示器被设计用来检测和预防高速公路上的事故。
3. 3. The true motion indicator can provide real-time data on the movement of objects in space.
   真动指示器可以提供关于空间中物体运动的实时数据。