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

它的答案来自欧洲，尤其是来德国的鲁尔山谷。

youdao

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

莱茵河流过鲁尔山谷的西部边界，水生生物无法在里面生长。

youdao

A city of western Germany in the Ruhr Valley south-southwest of Münster. It is a commercial and industrial center. Population, 7', 428.

卡斯特洛普一罗克萨尔：西德一城市，位于明斯特西南偏南鲁尔谷。是一个商业和工业中心。人口7'，428。

youdao

In the Ruhr valley he found the environmentalist's holy grail and wrote a book about it.

ECONOMIST: Allen Kneese

For the best examples of this, we have to look to areas like Germany's Duisberg Nord Parc in the Ruhr Valley, or the beautiful green spaces of the Park Andre Citroen in Paris.

BBC: Martha Schwartz