slopstone

例句：

1. 1. The builder used limestone to build the walls of the house.
   建筑师用石灰石建造了房子的墙壁。
2. 2.The chalk was used as a writing material for ancient Egyptians.
   粉状石灰石被古代埃及人用作书写材料。
3. 3.The limestone is famous for its beautiful landscapes and historical sites.
   石灰石因其美丽的风景和历史遗址而闻名。