随着你离开快乐渺无音讯
[suí zhe nĭ lí kāi kuài lè miăo wú yīn xùn]
This translates as 'Happiness became intangible since you left'. It suggests sadness after a breakup or a friend's departure where joy seems to have vanished. It's about a state of depression, loneliness and missing someone deeply after they've left.