柠檬很酸却不及我心酸
[níng méng hĕn suān què bù jí wŏ xīn suān]
Translates to 'lemons are sour, but not as sour as my heart.' Lemons represent tartness, used as a metaphor for heartache that surpasses even their bitterness, indicating profound sadness or disappointment felt by the user.