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激素是内分泌腺产生的化学物质。内分泌腺是无导管的腺体,这些腺体分泌的激素直接进入血液。注入血液中的激素经身体转送到各
Hormones are chemicals produced by the endocrine glands. Endocrine glands are ductless glands that secrete hormones directly into the bloodstream. The hormones injected into the blood are transmitted to the body through the body