220个以上的城市人口将超过一百万。
More than 220 cities will have more than one million people.
城市人口达到百万以上时就已经产生对地铁的需求。
When the urban population has reached over millions, the demand of subway will generate.
百万级以上人口的中国城市将达到221座。
The number of Chinese cities with a million or more people will hit 221.
百万级以上人口的中国城市将达到221座。
The number of Chinese cities with a million or more people will hit 221.
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