P1: The first paragraph introduces the phenomenon of resonance and why it can damage the bridges. Then the idea of "seimisic isolation"(应该一个很老的idea 设计bridge) is proposed as a solution,就是在bridge与ground接触的地方放一些sliding-friction之类的,这个可以吸收地震波,可以左右动。
p2: The second paragraph explains how the proposed method protects the bridges from earthquakes