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 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. 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. 这比整个大西洋的鱼类种数还要多
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, 亚马逊河每年会带来10亿吨的泥沙
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. 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. 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. 全部流域面积达到南美洲的1/3