Definition: someone who has a lot of knowledge about a particular subject Level: C2
她是十七世纪英国文学方面的权威。
She is ___an ___authority ___on seventeenth-century English literature.
我把这本书读了六遍以上，成为了罗马帝国方面的权威。
I read the book more than six times and I became ___an ___authority ___on the Roman Empire.
他被广泛认为是量子物理学方面的权威。
He is widely regarded as ___an ___authority ___on quantum physics.
