alumstone

例句：

1. 1.The white stone is a symbol of purity and innocence.
   这块白色石头是纯洁和纯真的象征。
2. 2.The limestone quarry is located in the mountains.
   石灰石采石场位于山区。
3. 3.The limestone was used to build the ancient city walls.
   石灰石被用来建造古代城墙。