slate clay

例句：

1. 1. The pottery was made from a mixture of slate clay and straw.
   这个陶器是用一种混合了页岩粘土和稻草的混合物制成的。
2. 2.The ancient city is buried under layers of slate clay.
   这个古老的城市被页岩粘土层所覆盖。
3. 3. The engineer used slate clay to reinforce the foundation of the building.
   工程师使用页岩粘土来加固建筑的基础。