circular trace

例句：

1. 1. The circular trace is a circle that has been drawn on the map.
   圆形轨迹是在地图上绘制的一个圆。
2. 2. The car's trajectory was determined by the wind and the road conditions.
   汽车的轨迹是由风和道路条件决定的。
3. 3. The scientist made a series of circular traces to study the movement of the planets.
   科学家制作了一系列圆形轨迹来研究行星的运动。