rotating field instrument

例句：

1. 1.The rotating field instrument is used to measure the rotation of the earth's axis.
   旋转场仪器用于测量地球轴的旋转。
2. 2. The rotating field instrument was developed to improve the accuracy of satellite positioning.
   旋转场仪器被开发出来，以提高卫星定位的准确性。
3. 3. The rotating field instrument is crucial for monitoring the Earth's magnetic field.
   旋转场仪器对于监测地球磁场至关重要。