4 sentences

1. 他是皇室的正统继承人。

   tā shì huáng​shì de zhèng​tǒng jì​chéng​rén.

   He is the legitimate heir to the royal family.

   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

3. 他的学术观点非常正统。

   tā de xué​shù guān​diǎn fēi​cháng zhèng​tǒng.

   His academic views are very orthodox.

   Source: Dong Chinese Dictionary

4. 这件精美的古董瓷器据说制作于明朝正统年间。

   zhè jiàn jīng​měi de gǔ​dǒng cí​qì jù​shuō zhì​zuò yú Míng​cháo Zhèng​tǒng nián​jiān.

   This exquisite antique porcelain is said to have been made during the Zhengtong era of the Ming Dynasty.

   Source: Dong Chinese Dictionary