The headway distribution can be get by observation easily, but the arrival distribution not easy.

时距分布容易观测得到，而到达分布的观测却较难。

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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 order to improve inland waterway capacity, the arrival distribution and headway distribution of vessel traffic flow were analyzed.

为了提高内河航道通过能力，分析了船舶交通流的到船分布和船头间距分布特性。

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Elop has made headway on improving distribution in the U.S., where the company has had little presence in recent years.

FORBES: If Nokia Disappears, Don't Blame CEO Steve Elop