转迹线

例句：

1. 1. The scientist traced the origin of the disease to its source in Africa.
   科学家追溯了这种疾病的起源，发现它起源于非洲。
2. 2. The detective traced the trail of the thief through the city streets.
   侦探通过城市街道追踪到小偷的踪迹。
3. 3. The car's GPS system traced it back to a nearby gas station.
   汽车的GPS系统追踪到了附近的加油站。