两者作为从什么什么落下时用法是一样的,fall off/from a tree /bycicle 但是fall off 还有层意思是 减少,下降,衰落,fall from 可没有这意思
像 the sales amount this month is expected to fall off compared with last month ,这个月销售数量预计比上个月要下降
this industry is falling off year on year 这个行业一年比一年衰落了
fall off 减少;跌落;下降;离开;衰退
比如:
Our sales have begun to fall off. 我们的销售额已经开始下跌了。
fall from 从…落下
比如:
Fall is windy and leaves fall from trees. 秋天多风,树叶开始掉落。