城邦

例句：

1. 1. The ancient Greek polis was a model of democracy.
   古希腊城邦是民主的典范。
2. 2. The Roman Republic was a time of great political and cultural achievements.
   罗马共和国是政治和文化成就辉煌的时代。
3. 3. Today's city-states are often struggling to maintain their independence in a globalized world.
   当今的城市国家在全球化世界中常常努力维护其独立。