回忆再美好也只是曾经
[huí yì zài mĕi hăo yĕ zhĭ shì céng jīng]
No matter how wonderful the memories, they're now only in the past. It emphasizes cherishing present reality although fond recollections might seem better sometimes yet those times have gone henceforth we shall live forward embracing changes ahead rather than dwelling back longingly what used-to-be