蓝蜡笔描不出忧伤绿铅笔掩不住孤单
[lán là bĭ miáo bù chū yōu shāng lǜ qiān bĭ yăn bù zhù gū dān]
A poetic way to say that no color or artistic medium (blue pencil unable to draw sadness, green pencil cannot cover loneliness) can perfectly express or hide feelings like sadness and loneliness. This reflects deep emotional struggles and inner conflicts about emotions being both vivid yet hard to portray.