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退黑激素
tuìhēijīsù
1. melatonin

Character Breakdown

退
tuì
to retreat, to step back, to withdraw
HSK 5 9 丶
黑
hēi
black; dark; evil, sinister
HSK 2 12 丶
激
jī
to arouse, to incite; acute, sharp; fierce, violent
HSK 4 16 丶
素
sù
plain; white; vegetarian; formerly; normally
HSK 5 10 丶

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Category
Chinese