抓不牢的是我们的曾经抱不住的是你我的回忆
[zhuā bù láo de shì wŏ men de céng jīng bào bù zhù de shì nĭ wŏ de huí yì]
It depicts the pain of losing grip on past experiences and shared memories that have faded over time; it emphasizes regret and inability to hold onto fleeting moments in one's relationships.