lota

例句：

1. 1.The beach is littered with small pebbles.
   海滩上散布着许多小石子。
2. 2.The road was paved with smooth cobblestones.
   这条路铺满了光滑的卵石。
3. 3. The river flows over smooth gravel.
   河流流过平滑的砾石。