translation.en: We manipulated people's serotonin levels by giving them this really disgusting-tasting artificial lemon-flavored drink that works by taking away the raw ingredient for serotonin in the brain.
translation.zh: 通过提供这种极其难喝的柠檬味饮料 来操控人们的血清素水平 其原理是带走大脑中制造血清素 的原料