Bridges are the most seismically vulnerable structures in a highway system.

桥梁是交通生命线系统中的重要枢纽结构。

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Bridges are the most important structures in a highway system.

桥梁是交通生命线系统中的重要枢纽工程。

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Bridges are the most important structures in a highway system.

桥梁是交通生命线系统中的重要枢纽工程。

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