youth在牛津大词典中的解释如下：
1 [uncountable] the time of life when a person is young, especially the time before a child becomes an adult.
He had been a talented musician in his youth.
She regrets that she spent her youth travelling and not studying.
2 [uncountable] the quality or state of being youngShe brings to the job a rare combination of youth and experience.
His youth gives him an advantage over the other runners.
3 [countable] (often disapproving) a young manThe fight was started by a gang of youths.
4 (also the youth) [plural] young people considered as a group
the nation's youth
the youth of today
youth culture
youth unemployment