What are the "four major industries"?

Agricultural and sideline food processing industry, tobacco products industry, non-ferrous metal smelting and calendering processing industry and electric thermal production and supply industry are called four major industries.

The four major industries have a wide range of names, such as telecommunications, construction and so on.

The primary industry and the secondary industry are more specific.

Primary industry: agriculture and construction.

Secondary industry: industry

Tertiary industry: business service industry.

The fourth industry: communication