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1. Demographers usually put the city's population capacity at 18 million, based on the land area that can be developed for human habitation.

2. Some Chinese demographers worry that the gender imbalance may create a havoc that will haunt the country for generations.

3. " The increasing difficulties men face finding wives may lead to social instability, " said the report by more than 300 Chinese demographers after two years'research.

4. Demographers estimate there are 10 million households that lost their only child in China.

5. Demographers estimate that more than 2 million parents on the mainland who abide by the family planning policy will be childless by 2020.

6. Demographers say people over 65 will account for more than a third of the population by 2050.

7. Many demographers insist that the government should continue its tight control over population growth.

8. Some demographers have even accused the economic view of China's population trends as being shortsighted, given the country's lack of land and water resources.

9. Preston, one of the world's leading demographers and a sociologist at the University of Pennsylvania.

10. Some Chinese demographers worry that the country will get old before getting rich.