美国是一个属于第一世界的发达国家的翻译：United States is a part of the first world of developed countries 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

The United States is a part of the first world countries

United States is a part of the first world of developed countries

US is one belongs to the first world developed country

The United States is one of the world's least developed countries.

United States is a part of the first world of developed countries