efficient
/ɪˈfɪʃnt; ɪ`fɪʃənt/ adj
1 (of people) able to work well; capable （指人）能胜任的; 有能力的
an efficient secretary, teacher, administrator, etc 能干的秘书、 教师、 行政人员等
He's efficient at his job. 他胜任工作.
2 (esp of tools, machines, systems, etc) producing a satisfactory result without wasting time or energy （尤指工具, 机器, 系统等）有效力的
an efficient new filing system 有效的新归档系统.