It shares, with Canada, the second longest river system in North America and has over half the coastline of the United States.

它与加拿大共享北美第二长的河流系统，拥有美国一半以上的海岸线。

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The success of their agriculture system depended upon them knowing when the river would change.

他们农业系统的成功归功于他们了解河流何时会变化。

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The river system of the Mississippi River and the Missouri River is the longest river system in North America at 3,902 miles.

密西西比河和密苏里河水系是北美最长的水系，全长3902英里。

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Officials could close shipping connections between Lake Michigan and the upper Mississippi River system.

VOA: special.2009.12.15

One of the essential parts of the river system is sediment, which forms a variety of habitats and environments.

UNESCO: OFFICE IN VENICE

But the river system that covers two-thirds of Australia's irrigated farming land is also suffering from decades of overuse.

ECONOMIST: To turn a drought into wine

The Mekong and its tributaries yield more fish than any other river system.

ECONOMIST: The Mekong river