track span

例句：

1. 1. The detective followed the clues to find the thief.
   侦探根据线索追踪到了小偷。
2. 2. The team used a track to monitor the progress of their project.
   团队使用一个追踪器来监控他们的项目进展。
3. 3. The lost dog was found by a volunteer who had been tracking it for hours.
   一名志愿者在追踪了几个小时后找到了丢失的狗。