请点击收听：Long_Yingtai1

Long_Yingtai2

关键词：东欧，政治，改革，历史，柏林墙，东德，西德，political reform, politics, the Berlin Wall, Eastern Europe

本篇词汇：
https://docs.google.com/document/d/11AH_R7GUOP4UIBbPYaG1Qq71vmOt8rjoHPHY8RobJA8/edit