rock fold

例句：

1. 1. The rock folds are visible from the top of the hill.
   从山顶上可以看到岩石的褶皱。
2. 2.The rocks in this area have been folded over time.
   这个地区的岩石经过长时间的折叠。
3. 3.The geologists were puzzled by the rock folds in the area.
   地质学家对该地区岩石的褶皱感到困惑。