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The planet's indisputable super river is the Amazon.
地球上的超級大河毫無疑問就是亞馬遜河
It carries as much water as the next top 10 biggest rivers combined.
它的水量是世界十大江河中其余9條大河的總和
Rising in the Peruvian Andes, its main trunk flows eastwards across Brazil.
它發源于秘魯安第斯山區，其干流穿越整個巴西
On its way, the system drains a third of South America.
全部流域面積達到南美洲的1/3
Eventually, over 4,000 miles from its source, it empties into the Atlantic Ocean.
最終，在經過4000英里的流程之后，亞馬遜河匯入了大西洋
The Amazon transports a billion tonnes of sediment a year,
亞馬遜河每年會帶來10億噸的泥沙
sediment clearly visible at the mixing of the waters,
泥沙使得河水交匯成為一道顯眼的風景
where one massive tributary, the Rio Negro, flows into the main river.
一條巨大的支流--內格羅河在此匯入干流
Its waters are wonderfully rich.
河水中的物種異常豐富
To date, over 3,000 species of their fish have been described, more than in the whole of the Atlantic Ocean.
據統計，被命名的魚類已達到3000多種，這比整個大西洋的魚類種數還要多
The Amazon is so large and rich in fish that it can support freshwater dolphins.
亞馬遜河養育著豐富繁多的魚類，為淡水海豚提供了生存條件。
These botos are huge, 2.5 metres long.
這些亞馬遜江豚體型巨大，身長達2.5米
In these murky waters, they rely on sonar to navigate and hunt.
它們利用回聲定位在昏暗的水中探路和捕食
They work together to drive shoals of fish into the shallows.
它們一起合作把魚群趕到淺水區
