suttle

例句：

1. 1. The riverbed is covered in a layer of smooth pebbles.
   河床覆盖着一层光滑的鹅卵石。
2. 2.The path was littered with small stones and pebbles.
   小石头和碎石铺满了小径。
3. 3.The builders used large stones to pave the road.
   建筑工人用大石头铺设了道路。