The rise of racism in America is a serious concern.

美洲种族主义的抬头是一个严重忧虑。

《柯林斯英汉双解大词典》

So, this is becoming a serious concern.

所以，这已经成为一个严重问题。

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This is and should be a cause for serious concern.

这成为而且应当成为我们严肃关注的原因。

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The non-binding resolution expresses "very serious concern" at continuing reports of "systematic,widespread and grave violations of civil, political,economic,social and cultural rights,"

VOA: standard.2009.11.20

And that's a serious concern but the fact that the government itself took the lead in bringing that point to public attention suggests in part government's electorate interest So one should not take this all in their mighty actions.

这是个重大问题,但政府自身把这个事实,揭示给大众,说明政府在考虑如何划分选区,才符合自身利益,所以人们不应该将,这种观点带入可能的行为中。

普林斯顿公开课 - 国际座谈会课程节选

It worked: no longer is there serious concern that French will disappear from North America.

ECONOMIST: Canada

Mr. McGee addresses areas of serious concern that have largely remained off the radar screen.

WSJ: Book Review: Attention All Passengers

In total it flags up 27 areas of serious concern, and makes a series of recommendations.

BBC: Therapy