在英格兰metropolitan county与non-metropolitan county的区别？区域具体是如何划分的？

The metropolitan counties are a type of county-level country subdivision in current use in England. There are six metropolitan counties, which each cover large urban areas, typically with populations of 1.2 to 2.8 million. They were created in 1974 and are each divided into several metropolitan districts.

The county councils were abolished in 1986 with most of their functions being devolved to the individual boroughs, making them de facto unitary authorities. The remaining functions were taken over by joint-boards.

The metropolitan counties have population densities of between 800 (South Yorkshire) and 2800 (West Midlands people/km². Individual metropolitan districts range from 4,000 people/km² in Liverpool to only 500 people/km² in Doncaster.

The six metropolitan counties and their metropolitan districts are:

1. Greater Manchester: City of Manchester, City of Salford, Bolton, Bury, Oldham, Rochdale, Stockport, Tameside, Tr