有一些湿地在古代就形成了。There are some areas of wetland which are of ancient origin.他们不时陷入没膝的湿地。They sometimes sank knee-deep into the marsh.牛群在湿地上吃草。Cows were grazing on the marshes....
The company, New England Electric, burns coal to generate power.新英格兰电力公司用煤发电。Most cities generate a complex brew of pollutants.多数城市都会产生各种物质混杂的污染物。In the 19 th century waterpower was widely utilized to generate electricit...