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。
To lower cost in space transportation is one of the keys to the exploitation and exploration of space.
网络建模研究的重点是建模方法为代表的人民及货物的运输网络空间运动的研究。
The research focus in network modeling is the study of modeling approaches for representing the spatial movement of people and goods in transport networks.
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