心如薄荷天然凉心如柠檬天然酸
[xīn rú bó hé tiān rán liáng xīn rú níng méng tiān rán suān]
Translates to: 'My heart is naturally cool like mint, my heart is naturally sour like lemon.' It vividly compares emotional states using sensory feelings from tastes. Mint is fresh and cooling while lemons are sharp and tart. It could represent different facets of emotion and feeling.