historian

他的父亲是一位著名的历史学家。

His father was a famous ___historian.

作为一名历史学家，她专攻中世纪欧洲史。

As a ___historian, she specialized in medieval European history.

这位历史学家发表了一项关于中世纪欧洲的开创性研究。

The ___historian published a groundbreaking study on medieval Europe.