用介词on,例如:

1、She's an authority on criminal law.她是刑法专家。

2、He spoke with authority on the topic.他就这个课题发表权威意见。

3、He was one of Newcastle's most distinguished medical men, a world authority on heart-diseases.他是纽卡斯尔最优秀的医生之一,也是世界心脏病方面的权威。