地理漫步·世界地理英语30篇（6）
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The River’s Journey: From Mountain Spring to Ocean Delta
河流的旅程：从高山泉源到海洋三角洲
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Every river begins as a tiny trickle of meltwater or rain high in the mountains.每条河流都始于高山上的融雪或雨水形成的细小溪流。
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Gravity pulls this water downhill, gradually gathering more flow from tributaries and groundwater.重力将水流引向低处，并逐渐汇集支流和地下水，流量随之增大。
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As the river moves across flatter land, it slows down and starts depositing silt and sand.当河流流经地势较平坦的区域时，流速减缓，开始沉积泥沙。
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These deposits build up over centuries to form wide floodplains where rich soils support farming.这些沉积物历经数百年堆积，形成广阔的冲积平原，肥沃土壤支撑农业发展。
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Near the sea, the river splits into many channels, creating a fan-shaped delta full of wetlands.临近入海口时，河流分岔成众多水道，形成扇形三角洲，遍布湿地。
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Deltas are biologically rich but vulnerable to rising sea levels and upstream dam construction.三角洲生物多样性丰富，却易受海平面上升和上游建坝威胁。
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The Nile, Ganges, and Mississippi all have massive deltas that feed millions of people.尼罗河、恒河与密西西比河均拥有庞大三角洲，供养数百万人口。
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Human settlements often grow along rivers because they provide water, transport, and fertile land.人类聚落常沿河而建，因河流提供水源、运输通道和肥沃土地。
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Yet pollution, over-extraction, and channelization threaten river health worldwide today.然而，污染、过度取水和河道渠化正威胁全球河流健康。
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Understanding a river’s full journey helps us manage it sustainably for future generations.全面理解河流的完整历程，有助于我们为子孙后代可持续管理河流。