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並前往https://www.artba.org/2018/01/29/54000-american-bridges-structurally-deficient-analysis-new-federal-data-shows/

Over 54,000 American Bridges Structurally Deficient, Analysis ...

Americans cross these deficient bridges 174 million times daily. Average age of a structurally deficient bridge is 67 years, compared to 40 ...

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