track occupation diagram

例句：

1. 1. The train tracks are visible from the station.
   从车站可以看到火车轨道。
2. 2. The detective followed the trail of clues to find the thief.
   侦探顺着线索追踪到了小偷。
3. 3. She followed the dog's track and found it at the park.
   她跟着狗的踪迹，在公园找到了它。