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.
它并不涉及服务的质量问题(即服务的可靠性问题)，而是只定义服务如何提供必要的行为。
It does not address quality of service issues for how robust the service is, but simply whether the service provides the necessary behavior.
讨论基于交替计算模式的并发程序执行行为的可信性问题。
The paper discusses the faithfulness of the behavior of concurrent programs based on interleaved computation modes.
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