bud trace

例句：

1. 1. The detective carefully traced the footprints left by the suspect.
   侦探仔细地追踪了嫌疑人留下的足迹。
2. 2.The scientist followed the chemical reaction to understand its mechanism.
   科学家追踪化学反应以理解其机制。
3. 3. The trail of the lost hiker led back to the starting point.
   失踪的徒步旅行者留下的踪迹指引着他们回到了起点。