the First World
noun [ S ] old-fashioned uk/ˌfɜːst ˈwɜːld/ us/ˌfɝːst ˈwɝːld/
第一世界（指发达国家）
the richer countries of the world that have advanced economies. Some people find this use offensive.
Those of us who live in the First World consume more than 80% of the planet's resources.