小时候披着床单当仙女小时候穿着内裤当超人
[xiăo shí hòu pī zhe chuáng dān dāng xiān nǚ xiăo shí hòu chuān zhe nèi kù dāng chāo rén]
Translates into 'Wearing sheets as fairies when young, and wearing underwear as superheroes'. This reflects childhood innocence and imaginative play, expressing nostalgia and longing for simpler times when fun came easily from playing make-believe.