2 sentences

1. 二月通常有二十八天。

   èr​yuè tōng​cháng yǒu èr​shí​bā tiān.

   February usually has twenty-eight days.

   Source: Dong Chinese Dictionary

2. 二十八宿是中国古代划分星空的坐标。

   èr​shí​bā xiù shì Zhōng​guó gǔ​dài huà​fēn xīng​kōng de zuò​biāo.

   The Twenty-Eight Mansions are the coordinate system used to divide the stars in ancient China.

   Source: Dong Chinese Dictionary