lumen的精选

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用“lumen”造句大全，lumen造句

用“lumen”造句大全，lumen造句

2018-01-09
In1700atypicalBritonconsumed580lumen-hoursinthecourseofayear,fromcandles,woodandoil.Thelightperceivedbythehumaneyeismeasuredinunitscalledlumen-hours.Thisisabouttheamountproducedbyburningacandleforanho...