efficient/ɪˈfɪʃənt/
adj.有效的；效率高的an efficient secretary能干的秘书
The new secretary is a quick, efficient worker, and the boss is quite satisfied with her.新来的秘书是个敏捷的、效率高的工作人员，老板对她很满意。
This new copy machine is more efficient than the old one.这台新复印机比那台旧的效率高。