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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But it would lack a serious social network.

但是，它缺乏一个严肃的社会网络。

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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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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

It's a serious social investment.

WSJ: Dan Ariely, Author of Predictably Irrational, on Holiday Gifts

And so the question is, at what point can we have a serious conversation about Medicare and its long-term liability, or a serious question about -- a serious conversation about Social Security, or a serious conversation about budget and debt in which we're not simply trying to position ourselves politically.

WHITEHOUSE: President Obama Takes Questions at GOP House Issues Conference | The White House