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。
Some, like the two Elwha dams, were built without fish ladders, meaning they serve as completely impenetrable barriers to fish migrations.
youdao
搭一座心梯，缓步走入你的心里。
Take a ladder to walk slowly into your heart.
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