滚下

• devolution
• roll down

例句

1. 她滚下了楼梯。
   She tumbled down the stairs.
2. 当岩石沿着山坡滚下时，冲力便愈来愈大。
   As the rock rolled down the mountainside, it gathered momentum.
3. 球滚下了山。
   The ball rolled down the hill.
4. 石头滚下山。
   The stone rolled down the hill.
5. 石头滚下山时，它的动量增加。
   As the rock rolled down the mountainside, it gathered momentum.