我心比柠檬加醋酸
[wŏ xīn bĭ níng méng jiā cù suān]
'My Heart is Sour Even More Than Lemon Plus Vinegar': Here the author likens their heart's feelings of sadness or distress, possibly from experiences such as heartache, envy, jealousy or frustration, to sour flavors of lemon mixed with vinegar, suggesting an intense depth of these negative feelings.