对于不用自购汽车、雇佣驾驶员的创业公司来说，扩张成本大大降低。
The cost of expanding is far lower for a startup that does not own its own cars or consider its drivers employees.
使用一组情景来描述需求的不确定性，要求在所有情景下最大的网络扩张成本最小。
A set of scenarios to denote uncertainty of demand and the maximal cost of network expansion under all scenarios.
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