猫忘了鱼尾砂鱼忘了蓝蔚海
[māo wàng le yú wĕi shā yú wàng le lán yù hăi]
It poetically compares memory fading over time (cat forgetting fish tail sand and fish forgetting blue sea), conveying transient feelings or experiences. Might imply romantic idealism about memories dissolving into broader life experience.