the fact of shining in the dark; the ability to give out light 光度: 在黑暗中发光的事实;发光的能力The moon was shining enough to give a ghostly luminosity to the buildings that crowded both sides of the narrow street. 月亮足够明亮,给拥挤在狭窄街道两旁的建筑带来了幽灵般的亮度。 the luminosity of the stars/sun 星星/太阳的亮度
a clear and beautiful quality that something has 光度: 某物具有的清晰美丽的品质the luminosity of the poem 这首诗的精彩之处