大多数更贫穷的建造了地铁的城市，例如菲律宾的马尼拉、尼日利亚的拉格斯，因为开销太高而只能建造很少的几条线路。
Most poorer cities that have built subways, like Manila and Lagos, Nigeria, can afford to build only a few limited lines because of the expense.
大多数更贫穷的建造了地铁的城市，例如菲律宾的马尼拉、尼日利亚的拉格斯，因为开销太高而只能建造很少的几条线路。
Most poorer cities that have built subways, like Manila and Lagos, Nigeria, can afford to build only a few limited lines because of the expense.
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