| 词汇 | serotonin | 
| 释义 | serotonin  noun [ U ] uk/ˌse.rəˈtəʊ.nɪn/ us/ˌse.rəˈtoʊ.nɪn/  血清素 a neurotransmitter (= a chemical in the body that carries messages from the brain) that helps you feel relaxed and happy | 
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