Over the years the lake began growing over and on its site developed gigantic marshy ground, a self-sustained reservoir which can feed itself just with rainfalls.
多年以来，湖泊开始越来越多，并在其基础上侵占着巨大沼泽地面，自我维持的水库，单凭着降雨就足以维系。
3
Furthermore, it's now "a major component of acid rain" and is "found in almost every stream, lake, and reservoir in America."