Definition: a group of countries that is ruled by one person or government Level: C1
罗马帝国曾横跨三大洲。
The Roman ___empire once spanned across three continents.
历史学家们经常争论一个庞大帝国衰落的精确原因。
Historians often debate the precise causes behind the decline of a vast ___empire.
通过一系列军事征服，他试图建立一个持久的帝国。
Through a series of military conquests, he sought to build an enduring ___empire.
