3 sentences

1. 这所大学设有专门的外事办公室。

   zhè suǒ dà​xué shè​yǒu zhuān​mén de wài​shì bàn​gōng​shì.

   This university has a specialized foreign affairs office.

   Source: Dong Chinese Dictionary

2. 他曾多次在中南海参加重要外事活动。

   tā céng duō cì zài Zhōng​nán​hǎi cān​jiā zhòng​yào wài​shì huó​dòng.

   He has participated in important foreign affairs activities at Zhongnanhai on many occasions.

   Source: Dong Chinese Dictionary

3. 她在闺中绣花，不闻外事。

   tā zài guī zhōng xiù​huā, bù wén wài​shì.

   She stayed in her boudoir embroidering, indifferent to outside affairs.

   Source: Dong Chinese Dictionary