I don't set up to be an authority on this subject.

我不认为自己在这门学科方面是权威。

youdao

He used to be considered an authority on American history.

他常被认为是美国历史方面的权威专家。

youdao

He used to be considered an authority on American history.

他常被认为是美国历史方面的权威专家。

youdao