ser·o·to·nin
noun/ˌserəˈtəʊnɪn/
/ˌserəˈtəʊnɪn/
[uncountable]- 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
感觉良好的激素血清素 - serotonin—the happiness hormone
血清素——幸福激素
Word Origin1940s: from serum + tonic + -in. - the feel‐good hormone serotonin