Level 6 · word 18,615 of 20,000
melatonin
/ˌmeləˈtoʊnɪn/
American
- n. 褪黑激素
- Definition
- n. a hormone that helps control the body's sleep cycle
- Example
- He took melatonin every night to help him fall asleep faster.
- 他每晚都服用褪黑素，帮助自己更快入睡。
Word mapHormones