2 sentences

1. 暑假期间，许多大学生下乡参加志愿服务。

   shǔ​jià qī​jiān, xǔ​duō dà​xué​shēng xià​xiāng cān​jiā zhì​yuàn fú​wù.

   During the summer break, many college students go to the countryside to participate in volunteer work.

   Source: Dong Chinese Dictionary

2. 他响应号召去下乡，后来政策变了，他才回城。

   tā xiǎng​yìng hào​zhào qù xià​xiāng, hòu​lái zhèng​cè biàn le, tā cái huí​chéng.

   He responded to the call to go to the countryside, and only returned to the city later when the policy changed.

   Source: Dong Chinese Dictionary