薄荷加冰少年心凉柠檬加醋姑娘心酸
[bó hé jiā bīng shăo nián xīn liáng níng méng jiā cù gū niáng xīn suān]
A poetic phrase meaning 'Mint with ice cools down the youth's heart, while lemon with vinegar causes girls' hearts to feel sourness'. It describes young love where experiences bring coolness yet bittersweet emotions simultaneously to boys and girls.