粗砂石

例句：

1. 1. The road was covered in a thick layer of coarse sand.
   这条路上覆盖着一层厚厚的粗砂。
2. 2. He had to walk through the coarse sand to reach the other side of the river.
   他不得不穿过粗砂走到河的另一边。
3. 3. The builders used coarse sand to level the ground before laying down the concrete.
   建筑工人用粗砂平整地面，然后铺设混凝土。