The authorities are at their wits' end about juvenile delinquency.

当局对青年犯罪束手无策。

The problem of juvenile delinquency presented itself for the attention from the whole society.

年犯罪的这个问题引起了全社的注意。

We can curb juvenile delinquency by education.

我们可以通过教育来控制年犯罪。

He is an expert in juvenile delinquency.

他是研究青年犯罪的专家。