离开你以后我做不到快乐
[lí kāi nĭ yĭ hòu wŏ zuò bù dào kuài lè]
'离开你以后我做不到快乐' translates to 'after leaving you, I can't be happy'. This shows the lingering sadness and inability to feel joyful following a breakup or departure from a person or place that held special significance.