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melatonin

Related topics: Human, Drugs, medicines
mel·a·to·nin /ˌmeləˈtəʊnɪn $ -ˈtoʊ-/ noun [uncountableU]  
a hormone that is sometimes used as a drug to help you sleep 褪黑激素〔有时用作安眠药〕
Examples from the Corpus
Origin melatonin
(1900-2000) Greek melas black + English serotonin
mel·a·to·nin noun
Chinese
Syllable
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