trace hole

例句：

1. 1.The detective used his flashlight to tracethe path of the thief.
   侦探用他的手电筒来追踪小偷的路径。
2. 2. The scientist discovered a trace hole inthe rock formation.
   科学家在岩石构造中发现了一道痕迹孔。
3. 3. The hikers followedthe trail to find the lost treasure.
   徒步旅行者沿着小径寻找丢失的宝藏。