UN

例句：

1. 1. The UN has been working on a plan to resolve the conflict.
   联合国一直在努力解决冲突的计划。
2. 2. The UN is responsible for monitoring and protecting the environment.
   联合国负责监测和保护环境。
3. 3. The UN is a global organization that brings together countries to work towards peace and development.
   联合国是一个全球组织，将各国聚集在一起，致力于和平与发展。