小时候的谎言叫永远
[xiăo shí hòu de huăng yán jiào yŏng yuăn]
This translates as 'A lie from childhood called forever.' It refers nostalgically or regretfully to a promise made when younger that seemed endless or permanent at the time. Perhaps a vow or pact with friends or loved ones that was earnestly meant but may have ended up being broken or impossible.