He has recently made a significant discovery—loneliness is a serious social problem that can contribute to depression and even crimes, but it can be prevented in a clever way.

他最近有了一项重大发现——孤独是一个严重的社会问题，它会导致抑郁甚至犯罪，但可以用一种聪明的方法加以阻止。

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Juvenile delinquency is a serious social problem in this country.

少年犯罪是这个国家一个严重的社会问题。

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Social Juvenile delinquency is a serious social problem in this country.

少年犯罪上这个国家一个严重的社会问题。

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The Norwich city fathers, however, were sufficiently astute in recognizing the important role which the Hospital might play in caring for the city's poor (who now posed a serious social problem).

UNESCO: 2011 UK Memory of the World Register

We treat crime there is if it's normal, we treat other sorts of social dysfunction as though they are normal, and it's an enormous and serious problem for our country.

NPR: Could The President's Week Get Any Worse?