曾经旳曾经只是曾经未来旳未来还在待续
[céng jīng dì céng jīng zhĭ shì céng jīng wèi lái dì wèi lái hái zài dài xù]
Reflects on nostalgia, suggesting past events ('once upon a time') are just history now, no longer impacting the present. However, the future ('what is to come') remains unpredictable, full of ongoing possibilities.