In developed countries, polluting freshwater sources such as rivers, streams, lakes, and ponds is illegal, but still common practice for those who wish to avoid costly treatment of toxic waste.
在发达国家，污染河流，小溪，湖泊，池塘之类的淡水资源是违法行为，通常来说人们还是不愿意花大价钱来处理有毒的废料和废水。
youdao