白洋淀芦苇湿地是华北地区最大的淡水湖泊，近40年来，呈现出明显的退化趋势。
Baiyangdian reed wetland is the biggest freshwater lake in North China. However, it is obviously degenerated in the nearly 40 years.
白洋淀湿地是华北地区最大的淡水湖泊。
The Baiyangdian wetland is the biggest freshwater lake in North China.
白洋淀湿地是华北地区最大的淡水湖泊。
The Baiyangdian wetland is the biggest freshwater lake in North China.
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