For several weeks,the former president has been traveling to many cities to talk about the book.

VOA: special.2010.10.15

Many cities don't have subways because they don't have the need for them,

很多城市没有地铁，因为他们不需要，

地铁的好处 - SpeakingMax英语口语达人

Hotels in many cities have special deals for New Year's Eve: dinner,Champagne and a party.

VOA: special.2009.12.28

So how do you feed a city like, for example, Nairobi or many other very large mega-cities with desperately poor people in them where food simply cannot be provided in cities without access to diesel and so on?" Taylor says governments need to start investing in safe and sustainable energy alternatives.

VOA: standard.2009.10.20