marl slate

例句：

1. 1. The construction of the new bridge involved the use of marl slate for its foundation.
   建造新桥时使用了泥灰石作为其基础。
2. 2.The artist used a variety of materials including marl slate to create his masterpiece.
   这位艺术家使用包括泥灰石在内的多种材料创作了他的杰作。
3. 3. The town was built on top of a marl slate hill, providing an interesting contrast to the surrounding countryside.
   这个小镇建在一座泥灰石山的顶部，与周围的乡村形成了有趣的对比。