/ɪˈfɪʃnt/ Adjective (expecially of a system or machine) achieving maximum productivity with minimum wasted effort or expense (尤指系统或机器) 效率高的 fluorescent lamps are efficient at converting electricity into light. 荧光灯能将电能高效地转换成光能。 (of a person) working in a well-organized and competent way （人）有能力的，能胜任的 an efficient administrator. [in combination] preventing the wasteful use of a particular resource 防止造成…的浪费的 an energy-efficient heating system. 一种节能的供暖系统。