The paper introduces all kinds of hub-and-spoke networks and their characteristics in express freight, describes the current situation of their research and analyzes their research trend.
2
三大航空集团的网络从单一枢纽为主向多枢纽转变，轴辐式结构更加明晰；
The networks of the "Big Three" are now shifting from single hub to multi-hubs and the adoption of hub-and-spoke structure becomes more obvious.
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