2 sentences

1. 这些知识青年是国家建设的重要力量。

   zhè​xiē zhī​shi​qīng​nián shì guó​jiā jiàn​shè de zhòng​yào lì​liang.

   These educated youths are an important force for national construction.

   Source: Dong Chinese Dictionary

2. 他在农村当了五年的知识青年，后来才回城。

   tā zài nóng​cūn dāng le wǔ nián de zhī​shi​qīng​nián, hòu​lái cái huí​chéng.

   He spent five years as an educated youth in the countryside before returning to the city.

   Source: Dong Chinese Dictionary