An empire is a number of individual nations that are all controlled by the government or ruler of one particular country.
双语例句
例： the Roman Empire.
罗马帝国。
例： The empire collapsed in 1918.
该帝国在1918年崩溃了。
例： The French empire had expanded largely through military conquest.
法兰西帝国主要是通过武力征服来扩张的。