The outer river is a natural river course, whose main function is to drain floods during rainy seasons.

外江是自然河道，其作用是在雨季排泄大量洪水。

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In the lower reaches, where the current slows, the natural accumulation of sediment in the riverbed has caused the river to change course often in the past.

在河流下游，由于流速变缓，泥沙(等沉淀物)自然而然地堆积在河床中，曾经造成黄河经常改道。

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Natural River Lake in residential construction and acquisition features to developers and real people are of course ideal choice.

在自然河湖边建造和购置水景住宅，对开发商和购房人来说当然都是理想的选择。

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The aim is to divert the river by a few metres and then allow it to flow on its natural course.

BBC: Ethiopia diverts Blue Nile for controversial dam build