trail formation

例句：

1. 1. The hikers followed a trail formation to reach the summit.
   徒步旅行者沿着一条小径形成物到达山顶。
2. 2. The trail formation is made of rocks and soil.
   小径形成物由岩石和土壤组成。
3. 3. The trail formation was created by the wind and water.
   小径形成物是由风和水创造的。