roll knobbing

例句：

1. 1.The ball rolled down the hill easily.
   球很容易滚下山坡。
2. 2. The leaves curled up in the cold wind.
   叶子在寒风中卷曲起来。
3. 3. The snake twisted its way through the grass.
   蛇蜿蜒穿过草地。