The River’s Journey: From Mountain Spring to Ocean Delta

课文

1. 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汇成的细小溪流。

2. 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。

3. As the river moves across flatter land, it slows down and starts depositing silt and sand.

   当河流流经地势平坦的区域时，流速减缓，开始沉积泥沙。

4. 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。

5. Near the sea, the river splits into many channels, creating a fan-shaped delta full of wetlands.

   临近入海口，河流分岔成多条水道，形成扇形三角洲，遍布湿地。

6. 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影响。

7. The Nile, Ganges, and Mississippi all have massive deltas that feed millions of people.

   尼罗河、恒河和密西西比河均拥有庞大三角洲，供养数以百万计人口。

8. 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。

9. 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。

10. 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。