loamy gravel

例句：

1. 1.The beach is covered in a layer of loamy gravel.
   海滩上铺满了一层砾石。
2. 2.The riverbed is lined with smooth loamy gravel.
   河床被光滑的砾石所覆盖。
3. 3. The farmer used to use loamy gravel for his compost pile.
   这位农民过去用砾石来堆肥。