They are seriously concerned about security.

他们非常关注安全问题。

《牛津词典》

We are seriously concerned about the relevant report.

我们严重关切媒体有关报道。

youdao

He was very seriously concerned with the problems involved.

他非常关心与此相关的问题。

youdao

"We are also seriously concerned with the recommendations that these allegations be taken up by the Security Council and then possibly referred to the International Criminal Court."

VOA: standard.2009.09.29

"They would be seriously concerned that there would be a job loss announcement, " he said.

BBC: Seagate

If Dr. Bernanke were paying attention to the numbers, he would be seriously concerned right now.

FORBES: QE Part III, Peanuts Edition: Ben Bernanke As Lucy Van Pelt

Its authors said they were "seriously concerned about the effect on patient management and safety".

BBC: Stafford Hospital breast cancer services criticised