柠檬凉了半个夏薄荷酸了谁的心
[níng méng liáng le bàn gè xià bó hé suān le shéi de xīn]
Translating to 'lemon has chilled half the summer; mint's sourness stirs whose heart,' this poetic expression describes emotions of cooling, fading joy and bitter-sweet memories, metaphorically using lemonade that cools and mints that leave a sour tinge, possibly reflecting on the passage of time and changes within oneself or in relations with others during the fleeting season of summer.