2 sentences

1. 子时是古代时段中的第一个。

   zǐ​shí shì gǔ​dài shí​duàn zhōng de dì​yī gè.

   Zi shi is the first of the ancient time periods.

   Source: Dong Chinese Dictionary

2. 交通高峰时段路上非常拥堵。

   jiāo​tōng gāo​fēng shí​duàn lù shàng fēi​cháng yōng​dǔ.

   The roads are very congested during peak traffic hours.

   Source: Dong Chinese Dictionary