并非信念本身，而是由积极信念引发的思想行为连锁反应。
Not because of the belief itself, but because of the chain of thoughts and actions triggered by a positive belief.
一旦更改模型的行为，就不得不进行连锁更改，因为必须要更改模型对象和围绕这些模型的测试用例。
I also force rippling changes whenever I change the behavior of my models, because I must change the model object and the test cases that surround them.
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.
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