rimule

例句：

1. 1. The river flows over smooth cobblestones.
   河流流过平滑的小圆石。
2. 2.They walked along the path lined with smooth pebbles.
   他们沿着铺满光滑卵石的小路走着。
3. 3.The old house was surrounded by a circle of smooth pebbles.
   旧房子周围是一圈光滑的卵石。