para-rock

例句：

1. 1. The para-rock formations are a fascinating study of Earth's history.
   这些副岩形成物是研究地球历史的迷人课题。
2. 2. The para-rock layers in the area contain valuable minerals that can be used for industrial purposes.
   该地区的副岩层含有有价值的矿物，可用于工业用途。
3. 3. The para-rock is often used as a building material due to its strength and durability.
   由于其强度和耐用性，副岩常被用作建筑材料。