十八岁那时候的初恋十八岁那时候的恋爱
[shí bā suì nèi shí hòu de chū liàn shí bā suì nèi shí hòu de liàn ài]
It describes 'the first love and romantic relationship at the age of eighteen'. The person possibly wants to cherish those innocent and pure emotions from early youth.