人忆七年鱼忆七秒
[rén yì qī nián yú yì qī miăo]
It's based on popular belief in Chinese culture where goldfishes only possess seven seconds of memory. Here, it could be metaphorically stating that people remember experiences much longer - in years - whereas the fish lives moment to moment with little long-term memory. It might symbolize how humans tend to overthink past events or attach importance, while animals live more in the present.