美国河乌在毗邻甘尼逊河的峡谷里筑巢。

American dippers build their nests in the gorge, next to the Gunnison River.

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奥加拉拉河使高平原地区能够向美国供应大量棉花、高粱、小麦和玉米。

Ogallala water has enabled the High Plains region to supply significant amounts of the cotton, sorghum, wheat, and corn grown in the United States.

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例如，在19世纪，一场大地震改变了密西西比河，一条流经美国中部的大河的流向。

For example, in the 1800s a monstrous earthquake changed the course of the Mississippi River, a large river flowing in the central part of the United States of America.

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