当然，城市的交通规划者们对于这个问题也是很清楚的，毕竟，城市交通总是充斥了各式各样的负外部性问题，例如某位司机轻踩刹车的微小行为，就会引发一连串的连锁效应，对众多其他司机产生影响。
Urban planners know this problem all too well. After all, traffic is filled with negative externalities.
考虑连锁反应。你的问题会带来什么反应？是一件事情还是一连串的事情？
Think about the triggers. What triggers your problem? Is it one thing or a variety of things?
好像是一件无关紧要的小事引起了一连串的连锁反应。
It is as if a singleunimportant event set up a chain of reactions.
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