主要是 off 和down 的区别。off 指“离开一个位置”,down 指“到了一个位置的下面”。所以fall down 的意思是“跌落到一个位置的下面”, fall off 的意思是“脱离开一个位置跌落下来”。fall off 等于 fall down from,例如:
脚下一滑就可能从建筑物上跌下去。
One slip and you could fall offthe building.
One slip and you could fall downfrom the building.
初学骑自行车时, 常会从车上掉下来。
When you are learning to ride abicycle, you often fall off.
When you are learning to ride abicycle, you often fall down from it.
有