the

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and in the breeding season there is stiff competition for mates.
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and in the breeding season there is stiff competition for mates. 在繁殖季节 会有一场激烈的求偶竞赛

The Amazon is so large and rich in fish
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The Amazon is so large and rich in fish 亚马逊河养育着丰富繁多的鱼类

where one massive tributary, the Rio Negro, flows into the main river.
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where one massive tributary, the Rio Negro, flows into the main river. 一条巨大的支流 ——内格罗河在此汇入干流

more than in the whole of the Atlantic Ocean.
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more than in the whole of the Atlantic Ocean. 这比整个大西洋的鱼类种数还要多

it empties into the Atlantic Ocean.
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it empties into the Atlantic Ocean. 亚马逊河汇入了大西洋

The Amazon transports a billion tonnes of sediment a year,
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The Amazon transports a billion tonnes of sediment a year, 亚马逊河每年会带来10亿吨的泥沙

sediment clearly visible at the mixing of the waters
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sediment clearly visible at the mixing of the waters 泥沙使得河水交汇成为一道显眼的风景

It carries as much water as the next top-ten biggest rivers combined.
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It carries as much water as the next top-ten biggest rivers combined. 它的水量是世界十大江河中 其余9条大河的总和

Rising in the Peruvian Andes, its main trunk flows eastwards across Brazil.
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Rising in the Peruvian Andes, its main trunk flows eastwards across Brazil. 它发源于秘鲁安第斯山区 其干流穿越整个巴西

On its way the system drains a third of South America.
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On its way the system drains a third of South America. 全部流域面积达到南美洲的1/3