1. 效率;效能;功效
Efficiency is the quality of being able to do a task successfully, without wasting time or energy.
e.g. There are many ways to increase agricultural efficiency in the poorer areas of the world.
有很多方法能够提高世界贫困地区的农业效率。
e.g. ...energy efficiency.
能效
2. （物理学、工程学中的）效率，功率
In physics and engineering, efficiency is the ratio between the amount of energy a machine needs to make it work, and the amount it produces.
名词功效; 效率，效能; 实力，能力; [物]性能