关于lumen的文学精选
精彩的lumen专题,是lumen相关知识的精华点,学习中疑虑的lumen方面内容,从lumen专题开始,不再是难题,为网友们免费分享lumen知识大全,lumen知识精选,lumen优质内容,没错,这里会有你需要lumen知识内容的。
-
lumen造句
In1700atypicalBritonconsumed580lumen-hoursinthecourseofayear,fromcandles,woodandoil.Thelightperceivedbythehumaneyeismeasuredinunitscalledlumen-hours.Thisisabouttheamountproducedbyburningacandleforanho...