灿烂烟火一瞬既美繁华星空一转既后
[càn làn yān huŏ yī shùn jì mĕi fán huá xīng kōng yī zhuăn jì hòu]
It poetically describes that like beautiful fireworks illuminating the sky in an instant, and the starry sky changes in a twinkling, this implies fleeting but intense moments of beauty and glory that quickly pass.