听西瓜说连夏天都走了
[tīng xī guā shuō lián xià tiān dōu zŏu le]
In Chinese culture, watermelon is typically eaten in summer. This implies melancholy about time slipping away - even the summertime, usually represented by watermelons and associated with enjoyment, has faded away according to the narrator, indicating sadness about lost joyous days or a significant person leaving.