German reunification in 1990 saddled the country with East Germany's low-grade brown coal plants, the dirtiest in Europe.
1990年德国统一，东德很多使用粗煤的低级工厂并入了西德，这是全欧洲最脏的工厂。
2
The Ohio river has been called the American Ruhr, As in Germany, the area along the river is rich in valuable deposits of high-grade coking coal and is well known for its steel industry.
俄亥俄河被称作美国的鲁尔河，就像德国一样，沿河有丰富的高品质的炼焦煤，并且因其钢铁而著名。
3
Generally speaking, the coal of power plant is low-grade, high-ash (the low content of fixed carbon) and the effect of direct gasification is bad.