She is an authority on this subject.

她是这方面的权威奥特。

He is an authority on corporate law.

他是公司法方面的权威.

Mr. Lee is an authority on astronomy.

李先生是天文学的权威。

Mr. Lee is an authority on astronomy .

李先生是天文学的权威。

We see him as an authority on the subject.

我们把他看作为这方面的权威。

She set up to be an authority on this project.

她觉得自己在这个项目上是权威。

The good dictionary is an authority on the meaning of words.

一本好的字典是词义方面的权威.

He is an authority on the subject of international economic and trade law.

他是国际经济贸易法律的权威.

I asked a close friend to find me someone who was both passionate and compassionate, an authority on the homeless issue.

我让一位好友帮我找一个既充满激情又富有同情心的人，一个对无家可归者问题具有一定权威的人。

Over the years one may well become an authority on one's hobby and will very probably be asked to give informal talks to little gatherings.

若干年里这个人很可能就会成为某种嗜好的权威，也将很有可能被邀请在小型集会作非正式讲话。