校服有多贵你舍不得脱三年青春一脱就是一生
[xiào fú yŏu duō guì nĭ shè bù dé tuō sān nián qīng chūn yī tuō jiù shì yī shēng]
'How expensive is the school uniform, you can't bear to take it off, for three years of youth once taken off it is a lifetime.' This is an emotive expression about the precious memories associated with one’s school days which lasts forever.