position circle

例句：

1. 1. The engineer used a positioning circle to mark the exact location of the new building.
   工程师使用定位圆来精确标记新建筑的位置。
2. 2. The team decided to use a positioning circle to ensure all participants were in the correct spot.
   团队决定使用定位圆以确保所有参与者都处于正确的位置。
3. 3.The scientist used a positioning circle to measure the distance between two points on the earth's surface.
   科学家使用定位圆来测量地球表面两点之间的距离。