“lumen”可以造什么句,lumen造句
来源:语文精选馆 1.03W
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.
In 1700 a typical Briton consumed 580 lumen-hours in the course of a year, from candles, wood and oil.
But to sleep with the blinds open, I'd have to buy a rifle and shoot out the confounded sodium vapor streetlight that, but for those blessed pecan strips, throws a 9,500-lumen glare over the room.