回忆再美只是回忆
[huí yì zài mĕi zhĭ shì huí yì]
'Hui Yi Zai Mei Zhi Shi Hui Yi' translates into memories are beautiful, but they remain only as memories. This conveys the bittersweet feelings attached to fond remembrances of past moments, knowing fully that no matter how cherished, those times can't return or stay, emphasizing the fleeting nature of happy times.