在1950年，纽约是世界上唯一一个人口超过一千万的城市。
In 1950, New York city was the only city with a population of 10 million.
现在有21个城市人口超过一千万，到2050年，还会出现更多这样的城市。
There are now 21 cities with populations larger than tenmillion, and by 2050 there will be many more.
现在有21个城市人口超过一千万，到2050年，还会出现更多这样的城市。
There are now 21 cities with populations larger than tenmillion, and by 2050 there will be many more.
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