On August 1, 2007, an eight-lane steel bridge over the Mississippi River in Minneapolis, Minnesota, collapsed2 during rush hour, killing3 13 people and injuring 145.
2007年8月1日，明尼苏达州明尼阿波利斯市密西西比河上一座八车道钢桥在交通高峰时倒塌，导致13人丧生，145人受伤。
An investigation4 concluded that the main cause of the collapse were undersized elements of the bridge that simply gave way under the heavy load.
调查结果表明，倒塌的主要原因是大桥上的小部件在重载下坍塌。
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