waste sand

例句：

1. 1. The construction site was littered with waste sand.
   施工现场到处都是废沙。
2. 2.The company has been using waste sand to fill the hole in the ground.
   这家公司一直在使用废沙来填补地面的洞。
3. 3.The sand from the desert is often used as a source of waste sand.
   沙漠中的沙子经常被用作废沙的来源。