In many cases, such as when the United Nations Environment Programme addresses cross-border environmental problems or when the World Health Organization deals with the spread of communicable diseases, cooperation among developing countries is imperative.
在许多情况下，例如在联合国开发计划署处理越界环境问题或在世界卫生组织处理传染病传播问题的情况下，发展中国家间的合作是必不可少的。