Dortmund entered the 20th century as the largest and most important industrial city in the Ruhrarea.
多特蒙德作为鲁尔区最大、最重要的工业城市迈进了20世纪。
2
The journal report is based on data from a continuing study done in three cities in the industrialized Ruhrarea of Germany.
这个杂志报告是基于一个持续的研究数据，这个研究是在德国鲁尔工业区的三个城市进行的。
3
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.