姑娘姑娘为谁心凉少年少年为谁心伤
[gū niáng gū niáng wéi shéi xīn liáng shăo nián shăo nián wéi shéi xīn shāng]
It speaks to the pain felt by young people (a girl and a boy) who experience heartache due to someone else's actions or feelings, possibly a past relationship.