《太平广记·卷二百三十二·器玩四》
这首诗的结尾两句，大意是这样的：正是月色清朗正好漫步观赏夜景的时候，祥瑞的仙炉飞降在醮坛前！
末句云：好是步虚明月夜，瑞炉蜚下醮坛前。
The last two lines of the poem mean: It is the time when the moonlight is bright and clear and perfect for a leisurely stroll to enjoy the beautiful scenery at night, and the auspicious immortal censer has flown down and landed in front of the altar for the Taoist ritual!