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Every year almost 2 thousand million tonnes of sediment
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Every year almost 2 thousand million tonnes of sediment 每年大约有20亿吨泥沙在此沉淀

they slow down, release their sediment and build deltas.
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they slow down, release their sediment and build deltas. 水流减缓 留下大量泥沙 堆成了三角洲

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

Now they are carrying heavy loads of sediment
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Now they are carrying heavy loads of sediment 河流中带着大量的泥沙

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