你是我心头抹不去的忧伤
[nĭ shì wŏ xīn tóu mŏ bù qù de yōu shāng]
'Nǐ shì wǒ xīntóu mǒ bù qù de yōushāng' translates into 'You Are The Sadness In My Heart That Cannot Be Removed', deeply conveying lingering sorrow over someone who caused lasting impact—likely pain or loss related to the individual named therein.