lumen造句
In1700atypicalBritonconsumed580lumen-hoursinthecourseofayear,fromcandles,woodandoil.Thelightperceivedbythehumaneyeismeasuredinunitscalledlumen-hours.Thisisabouttheamountproducedbyburningacandleforanho...
In1700atypicalBritonconsumed580lumen-hoursinthecourseofayear,fromcandles,woodandoil.Thelightperceivedbythehumaneyeismeasuredinunitscalledlumen-hours.Thisisabouttheamountproducedbyburningacandleforanho...