1. 透光率：luminousnebula 亮星云 | luminousness 透光率 | luminousnightclouds 夜光云
2. 亮度,透光率：luminous tube transformer 霓虹灯变压器 | luminousness 亮度,透光率 | lump 块,堆,团,总共,集中,集总,块煤
noun
1. the quality of being luminous
emitting or reflecting light
e.g. its luminosity is measured relative to that of our sun