日本东京（3530万）
报告指出，目前世界上人口最多的城市是日本东京（3530万）、紧随其后的是墨西哥城（1920万）、美国纽约（1850万）、印度孟买（1930万）和巴西圣保罗（1830万）。其他15座大城市的排名依次为：新德里、加尔各答、布宜诺斯艾利斯、雅加达、上海、达卡、洛杉矶、卡拉奇、里约热内卢、大阪－神户、开罗、拉各斯、北京、马尼拉和莫斯科。
参考资料：http://news.sohu.com/***********/n***********.shtml
Answer: Bombay Mumbai India (12,778,721)
Top 50 World's Largest Cities [Ranked by City Population]
1. 12,778,721 Bombay Mumbai India
2. 12,207,254 Karachi Pakistan
3. 11,055,365 Delhi India
4. 10,840,516 Shanghai China
5. 10,375,688 Moscow Moskva Russia
6. 10,147,972 Seoul Soul South Korea
7. 10,136,978 Sao Paulo São Paulo Brazil
8. 10,121,565 Istanbul Istanbul Turkey
9. 8,866,160 Lima Peru
10. 8,548,639 Ciudad de México Mexico City Mexico
11. 8,407,479 Jakarta Indonesia
12. 8,158,957 New York United States of America
13. 8,124,310 Tokyo Japan
14. 7,741,274 Beijing China
15. 7,620,971 Bogotá Colombia
16. 7,438,376 Al-Qahirah Cairo Egypt
17. 7,404,515 Tehran Iran
18. 7,318,636 Ar-Riyad Saudi Arabia
19. 7,287,555 London England
20. 7,192,209 Bogota Bogotá Colombia
21. 7,181,111 Lagos Nigeria
22. 6,956,562 Baghdad Baghdad Iraq
23. 6,942,751 Bangkok Thailand
24. 6,392,853 Lahore Pakistan
25. 6,080,671 Dacca Dhaka Bangladesh
26. 6,038,581 Rio de Janeiro Brazil
27. 5,158,019 Bangalore India
28. 5,147,431 Wuhan China
29. 5,083,657 Tianjin Tientsin China
30. 5,056,025 Canton Guangzhou China
31. 5,006,513 Toronto Canada
32. 4,930,694 Jiddah Saudi Arabia
33. 4,906,769 Abidjan Côte d'Ivoire
34. 4,865,499 Chongqing Chungking China
35. 4,810,997 Santiago Chile
36. 4,651,322 Calcutta Kolkata India
37. 4,408,220 Singapore Singapore
38. 4,368,883 Chennai Madras India
39. 4,178,234 Leningrad Sankt-Peterburg, St. Petersburg Russia
40. 4,111,624 Shenyang China
41. 3,866,382 Los Angeles United States of America
42. 3,796,043 Ahmadabad India
43. 3,719,989 Busan Pusan South Korea
44. 3,693,412 Alexandria Al-Iskandariyah Egypt
45. 3,619,856 Hyderabad Hyderabad India
46. 3,561,187 Ankara Turkey
47. 3,544,005 P'yongyang North Korea
48. 3,517,961 Yokohama Japan
49. 3,509,283 Montréal Canada
50. 3,462,648 Casablanca Morocco
