1. Super large cities refer to cities with urban population of more than 10 million.
 2. The report released by the United Nations Commission on Population and Development in 2005 said that with the acceleration of urbanization in the world, the number of "megacities" with a population of more than 10 million is also increasing rapidly.
 3. In 2006, Topper, the head of Robbie Environment Program at the United Nations, said: "By 2015 or 2020, there will be 27 to 30 metropolises with a population of more than 10 million in the world.
 4. There will be 18 such cities in Asia.
 5. Therefore, we should clearly realize that the focus of urbanization is in Asia.
 6. The word "metropolis" has a new standard of measurement - a population of more than 10 million.
 7. The city has become the largest and most complex architectural cluster in human history.
 8. In 2007, more than half of the world's population entered cities.