orthoptic circle

例句：

1. 1.The orthopic circle is a device used to measure the distance between two points on a map.
   正镜圈是一种用于测量地图上两点之间距离的装置。
2. 2.The orthopic circle was invented by a scientist who wanted to improve the accuracy of his measurements.
   正镜圈是由一位科学家发明的，他想提高他测量的准确性。
3. 3.The orthopic circle has been used in many different fields, including medicine and engineering.
   正镜圈在许多不同的领域都有应用，包括医学和工程学。