1. Industries are divided into three categories: industries that produce biological materials such as food, mainly referring to processing and manufacturing, and other industries other than primary and secondary industries, with a wide range. 2. The primary industry mainly refers to the industries that produce food raw materials and other biological raw materials, including planting, forestry, animal husbandry, aquaculture and other industries that directly target natural products. 3. The secondary industry mainly refers to the processing and manufacturing industry that uses the basic materials provided by nature and the primary industry for processing. 4. The tertiary industry refers to other industries other than the primary and secondary industries, with a wide range, mainly including intangible production departments such as transportation, communication, commerce, catering, finance, education and public services.