滚草

例句：

1. 1. The car was rolling down the hill when it hit a pothole.
   汽车在下山时撞上了一个坑。
2. 2. The horse is rolling in the pasture.
   马正在草地上滚动。
3. 3. The ball rolled across the field and into the net.
   球滚过了场地，进了网。