铅笔勾不出的微笑蜡笔绘不出的彩虹
[qiān bĭ gōu bù chū de wēi xiào là bĭ huì bù chū de căi hóng]
This username reflects feelings of unattainability and a sense of melancholy, implying that some things (such as the ideal smile or rainbow) cannot be achieved or depicted even with effort, like how pencils or crayons can't draw the perfect picture. The name carries a tone of romanticism.