地理漫步·世界地理英语30篇（9）
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Rivers Carry Sediment to the Sea
河流携泥沙入海塑造三角洲
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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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This material is called sediment, and it travels far.这种物质称为沉积物，可被搬运至很远的地方。
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Near the sea, rivers slow down and drop their load.临近海洋时，河流流速减缓，卸下所携沉积物。
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Sediment builds flat, fertile land called deltas.沉积物堆积形成平坦肥沃的土地，即三角洲。
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The Nile Delta feeds millions with rich farmland.尼罗河三角洲凭借富饶的农田养活数百万人。
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Deltas change shape as rivers shift course naturally.随着河流自然改道，三角洲的形态也随之变化。
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Human dams now trap much sediment upstream.人类修建的大坝如今在上游拦截了大量沉积物。
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Less sediment reaches coasts, affecting delta growth.抵达海岸的沉积物减少，影响三角洲的发育。