2 sentences

1. 武则天是中国历史上唯一的女皇。

   Wǔ Zé​tiān shì Zhōng​guó lì​shǐ shàng wéi​yī de nǚ​huáng.

   Wu Zetian was the only female emperor in Chinese history.

   Source: Dong Chinese Dictionary

2. 武则天是中国历史上唯一的正统女皇帝。

   Wǔ Zé​tiān shì Zhōng​guó lì​shǐ shàng wéi​yī de zhèng​tǒng nǚ huáng​dì.

   Wu Zetian was the only legitimate female emperor in Chinese history.

   Source: Dong Chinese Dictionary