埃尔瓦河

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Some, like the two Elwha dams , were built without fish ladders, meaning they serve as completely impenetrable barriers to fish migrations.

一些大坝和这两座埃尔瓦河大坝一样在建造的时候缺乏鱼梯设计，就是说它们完全阻碍了鱼群的洄游。

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