The journal report is based on data from a continuing study done in three cities in the industrialized Ruhr area of Germany.
2
地处德国西部的鲁尔工业区横跨10多个城市，原以煤炭开采和钢铁生产为主要产业。
The Ruhr industrial area located in the west of Germany crosses more than 10 cities and originally relied on coal mining and steel production as the major industries.
3
鲁尔区是欧洲最大最老的工业区之一，也是德国人口最稠密的地区之一。
Ruhr is one of the biggest and oldest industry areas in Europe, and is also one of the densest areas in Germany.
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