她在一个专注于发达国家环境问题的非政府组织工作。

She works for an NGO that focuses on environmental issues in ___developed countries.

发达国家的政府曾非常重视千年虫问题。

Governments of ___developed nations took the Y2K problem seriously.

许多发达国家拥有出色的公共交通系统。

Many ___developed countries have excellent public transport systems.