帝国

昔日的罗马帝国曾经非常强大。

xī rì de luò yuán dì guó zēng jǐn fēi cháng qiú dà 。

The former Roman Empire was once very powerful.

清帝国是中国历史上最长的帝制时期之一。

qīng dì guó shì zhōng guó lì shǐ shàng cháng de dì zhì shí qī zhe yī 。

The Qing Dynasty was one of the longest imperial periods in Chinese history.