In their cross-country journey, the animals must traverse many smaller bodies of water, such as rivers and small lakes.
在越野旅程中，动物们必须穿越许多面积较小的水域，比如河流和小湖泊。
The journey could take months, as families crossed rivers in the dead of night, traveled miles by foot, endured a rough and dangerous passage over the North Atlantic.
他们扶老携幼，长途跋涉，在深夜越过一道道河流，在横渡北大西洋时历尽艰险，有时需要辗转数月。
Now, eight major DAMS on the Snake and Columbia Rivers have exacted a toll on the fish in their 900-mile journey to the sea-one of the greatest migrations in nature.
如今，蛇河和哥伦比亚河上八个主要的大坝对这些鱼洄游到大海的900英里行程造成了巨大破坏——这是自然界最伟大的洄游之一。
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