水漂石

例句：

1. 1. The river flows through a beautiful valley with smooth stones and water-worn rocks.
   这条河流经一个美丽的山谷，山谷里光滑的石头和被水流冲刷的岩石。
2. 2. The rocky terrain is perfect for hiking and exploring the natural beauty of the area.
   崎岖的地形非常适合徒步旅行和探索该地区的自然美景。
3. 3. The river's current carries away the smooth stones from the riverbed.
   河流的流动带走了河床上光滑的石头。