超大城市 特大城市 megacity supercity
A megacity is defined as a city with a permanent urban population of 10 million or more, whereas a supercity is a city with a permanent urban population of over 5 million and under 10 million.
城区常住人口1000万或以上的城市为超大城市，城区常住人口500万以上1000万以下的城市为特大城市。
The population of the 21 megacities and supercities accounts for over 20 percent of China’s population.
21座超大城市和特大城市的人口占中国人口总数的20%以上。
The overall area of the 21 megacities and supercities covers about 7.5 percent of China’s urban land.
21座超大城市和特大城市的总面积占中国城市土地面积大约7.5%。
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