Which of these national parks is the largest wetland ecosystem in the U.S.?

以下哪个国家公园是美国最大的？

The plants and uneven ground of wetlands are part of the strong storm resistance the ecosystem provides.

植被和不平坦的表面让能抵抗强风暴力。

And that is not the only thing that makes this ecosystem unique.

除此之外，弗罗的还有其它与众不同之处。

The Laoyuhe Wetland is a typical example of how the eco-environment can purify the water that flows into the lake.

捞鱼河是净化水质的一个典型案例。