请问:fell down和fell off当跌落时的区别是什么?

请问:fell down和fell off当跌落时的区别是什么? fell down ,fell out ,fell off的区别在哪里 fell off 和 fell over的区别? fell off,fell down,fell over有什么区别? fell to fell into fell from fell off的区别 fall off和 fell off的区别? fell off和fell down有什么不同 fell down 与fell to的区别 比如 Fell down the ground 与 fell to the fell down 还是 fell off..摔倒. fell off的意思? fell down的意思 fall和fell的区别