3 sentences

1. 他是这个省的省委书记。

   tā shì zhè​ge shěng de shěng​wěi shū​ji.

   He is the provincial party secretary of this province.

   Source: Dong Chinese Dictionary

2. 他是党支部的书记。

   tā shì dǎng zhī​bù de shū​ji.

   He is the secretary of the Party branch.

   Source: Dong Chinese Dictionary

3. 书记负责记录会议的详细内容。

   shū​ji fù​zé jì​lù huì​yì de xiáng​xì nèi​róng.

   The secretary is responsible for recording the detailed contents of the meeting.

   Source: Dong Chinese Dictionary