youth

Compared meaning: young people as a group (noun).

比较义项：年轻人（作为一个群体）（名词）。

• young

  Used as a collective noun almost always with 'the' ('the young'), referring to young people as a group in general statements, often contrasted with 'the old'.

  作为集合名词几乎总是与“the”连用（“the young”），泛指年轻人这一群体，常用于和“the old”（老年人）对比的概括性表述中。

  The young are quick to embrace new technology, unlike the old.

  年轻人比老年人更快接受新技术。

• youth 本词

  Can be used without 'the' as a mass noun, common in formal or journalistic contexts referring to young people collectively, especially regarding social issues.

  可以不加“the”作为不可数名词使用，常见于正式或新闻语境中，用来统称年轻人，尤其在涉及社会议题时（如“youth unemployment”）。

  Youth unemployment remains a serious problem across Europe.

  青年失业问题在整个欧洲仍然十分严重。

Young and youth can both mean young people as a group. Young is almost always used with 'the', as in 'the young', often contrasted with 'the old'. Youth can be used without an article, as an uncountable noun, especially in formal or news writing.

这两个词在表示“年轻人（这一群体）”时意思相近，但用法不同：young通常必须加“the”构成“the young”，多用于与“the old”对比的概括性说法；youth则常可不加冠词直接作集合名词，多见于正式或统计性语境，如“youth unemployment”。此处不比较young作形容词表示“年轻的”，也不比较youth表示“青年时期／青春”的义项。