a chemical in the brain that affects how messages are sent from the brain to the body, and also affects how a person feels 5–羟色胺，血清素（神经递质，亦影响情绪等） the feel‐good hormone serotonin 感觉良好的荷尔蒙血清素 serotonin—the happiness hormone 血清素——快乐荷尔蒙
Word Origin1940s: from serum + tonic + -in.
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