1. The Ruhr valley has always been the centre of German heavy industry.

2. A city of west-central Germany in the Ruhr Valley northeast of Essen. It is a major industrial and coal-mining center. Population, 287,956.

3. The Ruhr Valley city of Dortmund, where ThyssenKrupp once made steel, still suffers from high unemployment because of the loss of jobs to lower-cost countries like China.

4. A city of northwest Germany in the Ruhr Valley northwest of Essen. It developed as a coal-mining center after the 1860's. Population, 112,353.

5. A city of northwest Germany in the Ruhr Valley northwest of Essen. It developed as a coal-mining center after the 8'0's. Population, 2,353.

6. A city of west-central Germany in the Ruhr Valley east of Essen. Chartered in 32, it is an industrial and commercial center. Population, 384,774.

7. The answer came from Europe, especially from the Ruhr Valley.

8. A city of west-central Germany in the Ruhr Valley northeast of Essen. It is a major industrial and coal-mining center. Population, 287,95'.

9. A city of west-central Germany in the Ruhr Valley west-northwest of Dortmund. It is an industrial center. Population, 7', 82.

10. A city of west-central Germany in the Ruhr Valley east of Essen. Chartered in 1321, it is an industrial and commercial center. Population, 384,774.

11. They have shared the same hulking blast furnace, dismantled and shipped piece by piece from Germany's old industrial heartland to Hebei Province, China's new Ruhr Valley.

11. try its best to gather and make good sentences.

12. Half a world away, neighbors of ThyssenKrupp's former steel mill in the Ruhr Valley of Germany once had a similar problem.

13. The Rhine River, which flows past the western edge of the Ruhr Valley, was devoid of marine life.