虚假的笑掩饰内心的伤
[xū jiă de xiào yăn shì nèi xīn de shāng]
'Jia Xie De Xiao Yan Shi Nei Xin De Shang' translates to 'A fake smile to cover the pain in my heart.' The user is probably trying to express the internal pain or sadness hidden by a cheerful exterior.