efficiency

英 /ɪˈfɪʃnsi/ 　美 /ɪˈfɪʃnsi/

n. 效率；效能The ability to achieve results without wasting time, energy, or resources

Organising my tools improved the efficiency of my work.

把工具整理好提高了我的工作效率。

Improving energy efficiency in public buildings can reduce government spending and lower greenhouse gas emissions.

提高公共建筑的能源利用效率，可以减少政府开支并降低温室气体排放。

搭配

energy efficiency 能源利用效率improve efficiency 提高效率operational efficiency 运营效率fuel efficiency 燃油效率

efficiency强调少浪费；effectiveness强调达到效果。

efficient (adj.)、efficiently (adv.)、inefficiency (n.)、inefficient (adj.)