track spot

例句：

1. 1.The detective followed the trail of the missing person.
   侦探沿着失踪者的踪迹追踪。
2. 2.The car tracks were clearly visible on the pavement.
   汽车轮胎在人行道上留下了清晰的印记。
3. 3. The scientist used a track spotter to locate the lost animal.
   科学家使用一个足迹探测器来定位丢失的动物。