My parents were concerned at my apparent lack of enthusiasm for school.

我看来对上学不感兴趣，使父母担心。

《牛津词典》

The authors are also concerned at PAHs, airborne pollutants produced by burning fuels.

由于燃料燃烧所造成的空气污染中的多环芳烃(PAHs)也使得报告的作者们倍感担忧。

youdao

We reported to them that we were concerned at this level of debt and we needed to redress it ...

我们向他们报告，我们关注这一级的债务，我们需要纠正它...

youdao

At first, she was concerned only with finding a way to keep control of The Washington Post until her sons were old enough to supervise it.

VOA: special.2009.04.26

But at last, I saw that as far as all states now existing are concerned, they are all badly governed.

但最后,我看到的是所有邦国，现存的所有邦国的统治都很糟糕。

耶鲁公开课 - 政治哲学导论课程节选

You remember they're wandering around the forest without her picking berries. The younger brother, - the second brother, is most concerned about his sister's safety -- so I want you to look at this passage.

你们记得他们在树林中游荡,没有拿他们采摘的果子，小哥哥，也就是二哥哥，是最关心他妹妹安全的-,所以我想让你们看这篇文章。

耶鲁公开课 - 弥尔顿课程节选

Mr Madden said people were concerned at proposals for some wind turbines measuring 100m tall.

BBC: 8,000 sign Anglesey petition against wind turbines

The Welsh Ambulance Service also said it was concerned at the handover delays at hospitals.

BBC: Wales NHS change 'may make pressure worse'

Environmentalists are also concerned at new subsidies for burning wood pellets in power stations.

BBC: Biofuels: MPs agree subsidies for power stations