Wetlands refer to the transition zone between land and water bodies. Together with forests and oceans, they are called the three major ecosystems of the earth. They play an important role in maintaining biodiversity, regulating climate, and resisting floods. The flood finally made people realize that wetlands (especially the many lakes and swamps connected to the Yangtze River) can buffer the flood. However, many lakes were artificially isolated because of the need for farming around the lake, leaving only A rarely opened sluice communicated with the Yangtze River, so these naturally formed water nets were cut off, and they were powerless in the face of floods. The text is intended to explain:. ['Farming around lakes is a wrong move that does more harm than good.', 'Occupation of wetlands is an important factor causing floods in the Yangtze River.', 'Human beings should reflect on the environmental damage caused by their actions.', 'The buffering effect of wetlands on floods should be brought into full play.']