關於lumen的百科

• lumen造句怎麼寫

• In1700atypicalBritonconsumed580lumen-hoursinthecourseofayear,fromcandles,woodandoil.Thelightperceivedbythehumaneyeismeasuredinunitscalledlumen-hours.Thisisabouttheamountproducedbyburningacandleforanhour.Buttosleepwiththeblindsopen,I'dhavetobuyarifle...
• 2018-01-098624