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註釋While you crane your neck to see the top of a skyscraper or gaze at a bridge spanning a vast river, it might seem impossible that such impressive structures can collapse. But as we see from footage during a news story, even the sturdiest buildings can crumble into a pile of metal, concrete, and wood. Sometimes the destruction is caused by winds from a hurricane or an increase in traffic on a bridge. Other times, the collapse may be caused by unsafe building materials. Understanding how such hazards can impact buildings, bridges, and levees can help architects, engineers, and contractors avoid devastating structural failures. Headline Science uses news stories and everyday applications to explain the science behind structural engineering failures.