puberty
noun [ U ] uk/ˈpjuː.bə.ti/ us/ˈpjuː.bɚ.t̬i/
青春期
the stage in people's lives when they develop from a child into an adult because of changes in their body that make them able to have children
At puberty, pubic hair develops and girls begin to menstruate. 青春期时，阴毛开始生长，女孩开始月经来潮。