1.We can curb juvenile delinquency by education.

1.我们可以通过教育来控制。

2.He is an expert in juvenile delinquency.

2.他是研专家。

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

3.当局对束手无策。

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

4.这个问题引起了全社会注意。