A.fall over B.fall off C.fall down这三个词什么意思

fall over
意外地从…上跌落,掉下来
The car fell over a cliff and the driver was drowned.
汽车从悬崖上翻下来,司机溺水而亡.
被…绊倒
He fell over a rock in his path.
他在小路上被一块石头绊倒了.
迫不及待做某事
Mother fell over herself to get the party ready.
母亲急切地为聚会做准备.
落在…之外
The ball fell over the line.
球落在线外.
fall off
跌落,滚落下
When you are learning to ride a bicycle,you often fall off.
初学骑自行车时,常会从车上掉下来.
突然降低; 向下斜
The land falls off here towards the river.
这儿的地势朝河的方向低了下去.
减少
The number of passengers by this line fell off slightly in January.
一月份这条航线的乘客数量略有减少.
变坏; 恶化
The cooking fell off remarkably.
烹饪质量大大降低.
逐渐消失,死亡
Words fall off by disuse.
词不用就会成为废词.
不再支持; 叛离
His friends fell off one by one.
他的朋友一个一个地跟他疏远了.
变瘦; (健康、精力等)衰退
He took care to keep the cattle from falling off.
他精心照料着牛群,不使它们瘦下来.
fall down
倒塌; 跌倒
Many buildings fell down during the earthquake.
在地震中许多楼房倒塌了.
失败
His plans have fallen down.
他的计划失败了.谢谢你讲的很详细