fall down(还是into）the river
问题描述：
fall down(还是into）the river
答
fall into the river
fall down是跌倒，失败，倒塌；fall into是落入
答
into
答
fall into
落入,陷入,掉进：
The boy fell into water and had to be pulled out at once.
男孩掉入了水中,必须马上拉上来.