wetland

Wetlands act as natural water filters, removing pollutants before they enter rivers and coastal waters.湿地如同天然的水体过滤器，在污染物进入河流和近海水域之前将其清除。

The drainage of wetlands for agriculture has led to significant losses of habitat for migratory birds.为发展农业而对湿地进行的排水改造导致候鸟栖息地大量丧失。