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ef·fi·cien·cy AHD[ĭ-fĭshʹən-sē] D.J.[ɪˈfɪʃənsiː]K.K.[ɪˈfɪʃənsi]n.（名词）【复数】 ef.fi.cien.cies 缩写 eff.- The quality or property of being efficient.效能：有功效的特征或性质
- The degree to which this quality is exercised:功效：这种特征所能达到的程度：The program was implemented with great efficiency and speed.项目以极大的效率和速度被实施
- The ratio of the effective or useful output to the total input in any system.效率：在某一系统中有效的或有用的产出与总投入的比率
- The ratio of the energy delivered by a machine to the energy supplied for its operation.功率：机器做一定功所发出的能量与其总能量的比
- An efficiency apartment.公寓小套间
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