sand clay road

例句：

1. 1. The beach is covered with soft sand.
   海滩上铺满了柔软的沙子。
2. 2. The builders used sand to level the land.
   建筑工人用沙子来平整土地。
3. 3. Sand is a natural resource that can be used for many purposes.
   沙子是一种自然资源，可以用于许多用途。