人类还通过给沼泽地排水、凿石劈山、修建公路和铁路等方式，改变了地球的面貌。
Man has also modified the face of the earth by draining marshes and cutting through mountains to build roads and railways.
我很清楚，挖沟排水和筑坝拦水正把许多河流和沼泽地搞得一团糟。
I was well aware that draining and damming were making a mess of many rivers and wetlands.
沼泽地：随季节淹没的低地，带有比湿地多的木质植物，比泥塘的排水要好。
A seasonally flooded bottomland with more woody plants than a marsh and better drainage than a bog.
沼泽地：随季节淹没的低地，带有比湿地多的木质植物，比泥塘的排水要好。
A seasonally flooded bottomland with more woody plants than a marsh and better drainage than a bog.
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