3 sentences

1. 德仁天皇是日本目前的国家元首。

   Dé​rén Tiān​huáng shì Rì​běn mù​qián de guó​jiā yuán​shǒu.

   Emperor Naruhito is the current head of state of Japan.

   Source: Dong Chinese Dictionary

2. 唐高宗曾自号“天皇”，与武后并称二圣。

   Táng Gāo​zōng céng zì hào“ Tiān​huáng”, yǔ Wǔ​hòu bìng chēng èr shèng.

   Emperor Gaozong of Tang once styled himself 'Heavenly Sovereign' and was known along with Empress Wu as the 'Two Sages'.

   Source: Dong Chinese Dictionary

3. 天皇、地皇和人皇在中国神话中并称三皇。

   Tiān​huáng, Dì​huáng hé Rén​huáng zài Zhōng​guó shén​huà zhōng bìng chēng sān​huáng.

   The Heavenly Sovereign, Earthly Sovereign, and Human Sovereign are collectively known as the Three Sovereigns in Chinese mythology.

   Source: Dong Chinese Dictionary