1. The nations of Eastern Europe, including Poland, Hungary, and the Czech and Slovak Republics, are considered the most polluted of all the world’s industrialized countries.
    东欧各国，包括波兰、匈牙利、捷克和斯洛伐克共和国，被认为是世界上工业化国家中污染最严重的。

2. In addition, Germany and the Czech Republic have signed a treaty to protect the Elbe River from further contamination.
    此外，德国和捷克共和国已签订了一项条约以保护易北河，使之不再进一步被污染。