农村地区 refers to rural areas, typically characterized by agricultural activities and a smaller population compared to urban areas.
城市地区: Refers to urban areas or cities, characterized by high population density, tall buildings, and various industries.
乡村地区: Refers to countryside areas that are less developed than rural areas but still have some basic infrastructure and amenities.
农民工: Refers to migrant workers from rural areas who move to cities for employment opportunities.