柠檬不酸了薄荷不凉了
[níng méng bù suān le bó hé bù liáng le]
The lemons aren't sour anymore and the mints aren't cold. This may imply changes over time have softened intense emotions such as sourness turning into sweetness, bitterness changing into tenderness. It also hints that sharpness and freshness once gone, symbolizing growth and change.