1590s, "power to accomplish something," from Latin efficientia "efficient power; efficiency; influence" (from efficientem; see efficient) + -cy. In mechanics, "ratio of useful work done to energy expended," from 1858. Attested from 1952 as short for efficiency apartment (itself from 1920).
实用例句
1. The spa is the last word in luxury and efficiency.
这家矿泉疗养浴场极尽奢华，功效极高。
来自柯林斯例句
2. Revenues from "green taxes" could then be channelled back into energy efficiency.
从“绿色税收”得来的收入便可回过头来用于提高能效。
来自柯林斯例句
3. It was achieved with minimum fuss and maximum efficiency.
事情事半功倍地完成了。
来自柯林斯例句
4. It doesn't take much to improve the energy efficiency of your home.
改善家庭能耗并非难事。
来自柯林斯例句
5. Defrost the fridge regularly so that it works at maximum efficiency.
