[mass noun]luminous quality 光度,亮度 acrylic colours retain freshness and luminosity. 丙烯酸涂料的颜色能够保持新鲜和明亮。 ■(Astronomy)the intrinsic brightness of a celestial object (as distinct from its apparent brightness diminished by distance) (天文)光度 ■(Physics)the rate of emission of radiation, visible or otherwise (物理)发光 效率