放肆的青春诠释了悲伤
[fàng sì de qīng chūn quán shì le bēi shāng]
'Reckless youth explained sadness' conveys the concept that a wild or unbridled youth has led to sorrow. The user might be reminiscing about reckless actions during their younger years, which resulted in regrets or sad moments that shaped their current view of the world.