seismic resistance of bridge structure
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Since the earthquake resistance of bridge structure and seismic effect are very difficult to be estimated accurately, there are many Bridges that have been damaged or collapsed in the earthquake.
由于人们尚难准确估计桥梁结构的抗震能力和地震作用，因而，桥梁结构在地震中破坏或倒塌的例子很多。
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