brockram

例句：

1. 1. The geologist found brockram in the area.
   地质学家在该地区发现了岩石。
2. 2. The construction crew used brockram to reinforce the foundation.
   建筑工人使用岩石来加固地基。
3. 3. The brockram formation is a key part of the region's geological history.
   岩石层是该地区地质历史的关键部分。