地理漫步·世界地理英语30篇（7）
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Rivers Carry Sediment to Build Deltas
河流搬运泥沙塑造三角洲
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Rivers pick up soil and rocks as they flow downhill.河流向下游流动时，会裹挟泥土和岩石。
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Fast water carries more sediment than slow-moving water.流速快的水比流速慢的水能携带更多泥沙。
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Near the sea, rivers slow down and drop their load.靠近海洋时，河流流速减缓，沉积所携泥沙。
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Sediment piles up in fan-shaped deltas over centuries.数百年来，泥沙堆积形成扇形三角洲。
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Deltas have rich soil and support farming and wildlife.三角洲土壤肥沃，支撑农业与野生动物。
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Some deltas shrink when dams trap upstream sediment.一些三角洲因上游水坝拦截泥沙而萎缩。
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Human channels and levees change natural delta growth patterns.人类修建的渠道和堤坝改变了三角洲自然生长模式。
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The Nile and Ganges deltas feed millions of people.尼罗河与恒河三角洲养育了数百万人。