3 sentences for 系 (xì — department)

1. 他在中文系学习汉语。

   tā zài Zhōng​wén xì xué​xí Hàn​yǔ.

   He is studying Chinese in the Department of Chinese.

   Source: Dong Chinese Dictionary

2. 我是历史系学生。

   wǒ shì lì​shǐ xì xué​sheng.

   I'm a history student.

   Source: OpenSubtitles

3. 我不觉得我接手的是英文系。

   wǒ bù jué​de wǒ jiē​shǒu de shì Yīng​wén xì.

   I don't feel like I inherited an English Department.

   Source: OpenSubtitles