在1700年一个普通的英国人一年消耗580流明时燃烧蜡烛、木材和油产生的光。

In 1700 a typical Briton consumed 580 lumen-hours in the course of a year, from candles, wood and oil.

youdao

而今天由于电灯的应用，他将消耗46 百万流明时，差不多是从前的十万倍。

Today, burning electric lights, he uses about 46 megalumen-hours—almost 100, 000 times as much.

youdao

人眼感受的光用流明时这个单位来衡量——燃烧一根蜡烛一个小时所产生的光的量就是一流明时。

The light perceived by the human eye is measured in units called lumen-hours. This is about the amount produced by burning a candle for an hour.

youdao