Except the difficulty and high cost of building the subway, it is superior to the buses in many aspects.
除了建设地铁的难度和高成本外,在许多方面它都优于公共汽车。
The spaces under these overpasses are often left unused except performing some public functions like serving as parking lots for buses and emergency equipment for road maintenance.
过去这些桥下空间除了停泊公交车、停留道路养护应急装备等公益功能外,不少都属于闲置状态。
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