the primary sector
noun [ S ] finance & economics specialized uk/ˈpraɪ.mə.ri ˌsek.tər/ us/ˈpraɪ.mɚ.i ˌsek.tɚ/
（采集和销售自然产品如谷物、石头、木材的）第一产业
industries that involve collecting and selling natural things, for example crops, rock, and wood, often in order for them to be made into something else
Compare: the secondary sector