lumen

n. 流明,内腔

lug, luge, luggage, luggage-rack, luggage-van, lugger, lugubrious, lugubriously, lugubriousness, lugworm, lukewarm, lull, lullaby, lumbago, lumbar, lumbar puncture, lumber, lumber-jacket, lumber-room, lumberjack, luminary, luminosity, luminous, luminously, lumme (also lummy), lump, lump sugar, lump sum, lumpish, lumpsum, lumpy, lunacy, lunar, lunar calendar, lunar month, lunatic, lunatic asylum, lunch, lunch-room, lunch-time,