Efficiency is the quality of being able to do a task successfully, without wasting time or energy.
双语例句
例： 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。
例： Refrigerators have improved energy efficiency by a third in 30 years.
冰箱的能源效率在30年中提高了三分之一。