Secondary production is the manufacturing and assembly process. This involves converting raw materials into components, e. G. Making plastics from oil, and assembling the product e. G. Building houses, bridges and roads.

• 第二级产品是属于制造和匹配的过程。它涉及到把原材料转换成为组成单元,例如,制造用油作原料的塑料制品,也涉及到产品的分配,例如,构建房屋,桥梁和道路。