姊妹市团体联盟

例句：

1. 1.The sister city grouping has been working together to promote cultural exchange.
   姐妹城市团体一直在努力促进文化交流。
2. 2. The sister city grouping is responsible for organizing the annual cultural festival.
   姐妹城市团体负责组织年度文化节。
3. 3.The sister city grouping has been discussing ways to improve their cooperation.
   姐妹城市团体一直在讨论如何改善合作方式。