roll back向后滚动 fall back后退、撤退 例句： The car began to roll back down the hill. 汽车开始倒着往山下滑。
The enemy fell back as our troops advanced. 我军部队挺进，敌军向后撤退。
roll back向后滚动 fall back后退、撤退 例句： The car began to roll back down the hill. 汽车开始倒着往山下滑。
The enemy fell back as our troops advanced. 我军部队挺进，敌军向后撤退。
