我深知你不是真正的快乐
[wŏ shēn zhī nĭ bù shì zhēn zhèng de kuài lè]
Translating directly into 'I know very well you're not truly happy'. This reflects a person's sensitive insight, acknowledging deep feelings beneath outward expressions, possibly referring to their own sentiments or their perception of another individual, highlighting emotional depth beyond what’s visible on the surface.