mealy sand

例句：

1. 1. The beach was covered in a layer of creamy sand.
   海滩上覆盖着一层细腻的沙子。
2. 2. The river flows through a valley of smooth, fine sand.
   这条河流经一个由光滑细沙构成的山谷。
3. 3. The builders used the sand to level the land for construction.
   建筑工人用沙子来平整土地以便建设。