work的名词：
worker [w:k] n.工人；劳动者；职蚁
working [w:ki]
n.工作；活动；制作；操纵
例句：
They have been working on the perfection of the new model.
他们一直在努力完善新型号。
She is an excellent worker and I commend her to you without reservation.
她工作出色，我毫无保留地把她推荐给你。
