Over the past 50 years researchers have made little progress in developing a general theory of traffic flow.

在过去的半个世纪里，研究人员在形成车流宏观理论方面鲜有进步。

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Instead of examining content, he looks at how messages move through networks, on the theory that the traffic flow of legitimate messages and spam should be different.

不用检查邮件内容，他基于合法邮件与垃圾邮件在传输流量上应有差异的理论来观察邮件在网络中的传输方式。

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Headway distribution and arrival distribution are two important distributions of traffic flow theory.

车头时距分布和到达分布是交通流理论中两个重要的分布。

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In theory, drivers will then adjust their departure times and smooth out the flow of traffic through the day.

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