luminous organ

例句：

1. 1.The moon is a luminous object in the sky.
   月亮是天空中一个发光的对象。
2. 2. The sun is a luminous source of light.
   太阳是一个发光的光源。
3. 3. The stars are luminous points of light in the night sky.
   星星是夜空中发光的点。