滾下的用法和樣例：
例句
-
她滾下了樓梯。
She tumbled down the stairs. -
當岩石沿著山坡滾下時，衝力便愈來愈大。
As the rock rolled down the mountainside, it gathered momentum. -
球滾下了山。
The ball rolled down the hill. -
石頭滾下山。
The stone rolled down the hill. -
石頭滾下山時，它的動量增加。
As the rock rolled down the mountainside, it gathered momentum.
