英语翻译American researchers have successfully developed a way t

英语翻译
American researchers have successfully developed a way to clean waste water without chemicals.The technique uses green plants.The tests were carried out at waste treatment center.The scientists put plants in narrow containers(容器) inside a glass building.One end of each container was a little higher than the other end.Waste water was directed was directed down the container through the plant’s thick roots.As we expected,the roots absorbed the wastes in the water and used them for food.At the same time the plants produced natural gas.The gas could be collected and sold as fuel(燃料).