Physical traits that appear during puberty in humans and other animals that distinguish the two sexes; same as [[第二性征|第二性徵|di4 er4 xing4 zheng1]]

The fundamental biological traits that distinguish males and females, specifically the reproductive organs such as the ovaries and testes.testes.

External physical and behavioral traits that appear in humans and animals after reaching sexual maturity, distinguishing the sexes beyond the primary reproductive organs