三三两两走散的曾经
[sān sān liăng liăng zŏu sàn de céng jīng]
It implies reminiscence or nostalgia for a past that's fragmented, not whole anymore, like pieces drifting apart. It conveys the regret of losing what once had and indicates people or things in the past scattered gradually with little left between the person and his/her former self.