youthful年轻的;青年的youthquake 青年运动大冲击youthism 年轻主义youthfully 早期地youthfulness 早期youth-and-old-age百日草老师祝你学习进步!望采纳,多谢!^_^
youthen变得年轻;使恢复青春youthhood青春期;不成熟