Hormone:a substance, usually a peptide or steroid, produced by one tissue and conveyed by the bloodstream to another to effect physiological activity, such as growth or metabolism.

• 荷尔蒙：一种物质，通常为肽或类固醇，由一组织产生，经由血液循环到达另一组织来影响生理活动，例如生长或新陈代谢。