tail /teil/ I. n.［c］尾巴，尾部：Cows use their tails to keep away flies. 牛用尾巴驱赶苍蝇。A crowd of boys formed the tail of the procession.一群男孩跟在队列的后面。‖II. v. 用于短语动词 tail off 下降，减少：The profits tailed off after a few years.几年后利润下降。