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1·Once the footway starts swaying, however subtly, more and more pedestrians adjust their gait to get comfortable, stepping to and fro in synch.

但一旦桥开始摇晃，哪怕只是轻微的晃动，也会使越来越多的行人调整自己的步调，通过不断的踏步调整来适应桥的晃动。

2·There are many factors which contribute to the uneven surface of precast paving slabs. this may be due to the heavy loading caused by illegal parking of vehicles on the footway ;

导致预制铺路砖表面凹凸不平的因素很多，包括在行人路上违例泊车，以致路面负荷过重； 铺砌方法不当； 以及掘路后进行的修复工程不合标准等。