猫虽有九条命却只有一颗心鱼有七秒的记忆第八秒忘记
[māo suī yŏu jiŭ tiáo mìng què zhĭ yŏu yī kē xīn yú yŏu qī miăo de jì yì dì bā miăo wàng jì]
Translated loosely into English as 'A cat may have nine lives but it has just one heart; a fish's memory only lasts for seven seconds so at the eighth second it is forgotten'. This username conveys sentiments related to the limited lifespan or ephemeral nature of existence and feelings despite the abundance of life or long memory.