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美国的主要大河是密西西比河及其支流密苏里河、俄亥俄河等,西部的科罗拉多河水量较小,汛情不严重。从防汛的工程技术措施看,美国与我国及世
The major rivers in the United States are the Mississippi River and its tributaries, the Missouri River and the Ohio River. The water in the Colorado River in the west is small and the flood is not serious. From the flood control engineering and technical measures, the United States and our world