To lower cost in space transportation is one of the keys to the exploitation and exploration of space.
低成本空间运输是实现人类对太空探索和开发的重要关键之一。
Grouping small shipment into large ones is the primary method to lower cost per unit of weight in transportation.
将小型运输组合成大型运输，是降低单位运输重量成本的主要方法。
The larger the traffic volume on the specific circuit is, the higher the density of passenger traffic, freight transportation, the lower the average transportation cost is.
特定线路上的运输量越大，客运密度、货运密度越高，平均运输成本就越低。
The larger the traffic volume on the specific circuit is, the higher the density of passenger traffic, freight transportation, the lower the average transportation cost is.
特定线路上的运输量越大，客运密度、货运密度越高，平均运输成本就越低。
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