英 [ɪˈfɪʃ(ə)nsi] 美 [ɪˈfɪʃ(ə)nsi]
n. 效率，效能；（机器的）功率
复数efficiencies
efficiency /ɪˈfɪʃənsɪ/ CET4 TEM4
不可数名词 Efficiency is the quality of being able to do a task successfully, without wasting time or energy. 效率
There are many ways to increase agricultural efficiency in the poorer areas of the world.
有许多提高世界较贫困地区农业效能的方法。
the ratio of the output to the input of any system
skillfulness in avoiding wasted time and effort
she did the work with great efficiency
事实上,灵敏度（Sensitivity）和效率（Efficiency）是不同的。我们常会谈到某喇叭型号的效率很高,?
原创：试谈如何加强施工过程中的造价管理 - 经济法律论文发表 - xzbu.com 中国论文网 关键词：施工企业；造价管理；效益 [gap=337]Key words: construction enterprise; cost management; efficiency
效率性(Efficiency),就是产出最大化程度或投入最小化程度,即以最小的投入得到预期的产出水平考察,或以既定的投入水平得到最大产出效果。
efficient 有效率的；有能力的；生效的
efficiently 有效地；效率高地（efficient的副词形式）
efficacy 功效，效力
She arranged everything with her customary efficiency.
她以她特有的高效率把一切都已安排妥当。
It was achieved with minimum fuss and maximum efficiency.
它以最少的慌乱和最高的效率被做到了。
Defrost the fridge regularly so that it works at maximum efficiency.
定期给冰箱除霜能取得最大效率。
Liberals say the fuel-efficiency requirements for the replacement vehicles are not strong enough for the environment.
VOA : special.2009.08.07
And in practical terms, we can define the efficiency as the ratio of the heat in to the work out.
在实际中，我们定义,效率为热与功的比值。
热力学与动力学课程节选 : 麻省理工公开课
In principle, this value, this efficiency, can approach 1 as the low temperature approaches absolute zero.
这个值，效率，当低温热源的温度1,是据对零度时可以达到一。
热力学与动力学课程节选 : 麻省理工公开课
The father is an efficiency expert, an expert in doing things better and faster.
VOA : special.2009.05.04
Some manufacturers are pushing cars to new levels of fuel efficiency.
VOA : special.2010.11.17
Time and time again, travellers to Switzerland report back that Swiss efficiency truly does exist.
The Attias make some lavish claims for what a circular layout does for building efficiency.
Tax efficiency is super high because fund has little turnover and only small dividend income.