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1. 
now Shanghai is China city in the largest.
2. 
half has century been steadily for population a Its growing.
3. 
stands million now at around people It 24.
4. 
true Shanghai a megacity is.
5. 
years city founded ago around The 1500 was .
6. 
excellent was in location an It
7. 
river major a meets where sea the.
8. 
going have years Merchants for been there
9. 
of harbour because excellent its.
10. 
of years In number been a problems have recent
11. 
in area urban appearing this.
12. 
developers larger been have building larger buildings As and,
13. 
1 1/2 has been city sinking by year about centimetres the a.
14. 
because was is built it swamp on originally a This.
15. 
prevent only way disaster to this The environmental
16. 
to construction stop is
17. 
appearing Fewer new have buildings and been fewer
18. 
skyline decade on last city's the the in,
19. 
thenone which building is world's why tallest reason
20. 
in no Shaghai longer is, in Dubai but.