She's a recognized authority on the subject.

她在这个学科上被公认为权威。

《牛津词典》

He's universally recognized as an authority on Russian affairs.

他被公认为是俄罗斯事务的权威。

《柯林斯英汉双解大词典》

Barbara Frederickson, a leading international authority on the importance of positive emotions, says humans are genetically programmed to seek positive emotions such as love and joy.

芭芭拉·弗雷德里克森是研究积极情绪重要性的国际领先权威，她说，人类的基因决定了寻求积极情绪，比如爱和快乐。

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Richard Pipes,a leading authority on Russia and a former anti-Soviet crusader who served in the Reagan administration, also stresses Mr.Gorbachev's pivotal role.

VOA: standard.2009.11.03

He became an authority, really one could say the authority on virtually everything.

他成为权威，一位真正可说是,几乎所有事物的权威。

耶鲁公开课 - 政治哲学导论课程节选

And I'm no scientist and I'm no specialist in sort of empirical matters, and believe me, I'm no authority on quantum mechanics, our best theory of fundamental physics.

我不是科学家,也不是实证方面的专家,相信我,关于量子力学,我并没有发言权,那可是基础物理中最经典的理论

耶鲁公开课 - 死亡课程节选

Calderon is really going to have to stamp his authority on the office right away.

NPR: Court President Backs Calderon Win in Mexico

The vote was non-binding but was seen as a blow to David Cameron's authority on Europe.

BBC: David Cameron: EU must reduce proposed budget rises

Scottish government agency Marine Scotland consulted the local authority on MeyGen Limited's proposed 86 megawatt project.

BBC: Waves