calcareous slate

例句：

1. 1. The ancient city is built on a bed of calcareous slate.
   这个古城建立在石灰石板岩上。
2. 2. The cliff face is covered in a layer of calcareous slate.
   悬崖表面覆盖着一层石灰石板岩。
3. 3. The builders used the calcareous slate from the nearby mountains to make their houses.
   建造者使用了附近山上的石灰石板岩来建造他们的房屋。