n.减少,跌落;
例句:
Leaves fall off the trees in the autumn.
秋天,树叶纷纷从树上掉下来.
Reach the exit to each levels, don't fall off the track.
达到出口到每一个水平, 不要滑出了赛道!
The circulation of the paper began to fall off sharply.
这家报纸的销路开始锐减.