So why are so many students still choosing to stay in the mega cities?

既然这样为什么大多数毕业生依然坚持在大城市就业呢？

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"One of things we worry about is mega cities could produce, at some point, a mega disaster," he said.

“我们最担心的事情是大城市有可能，在某个时刻，发生特大的灾难，”他说。

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To develop new residential areas at the suburb of mega cities, it is important to establish an effective transportation system for daily commuting travels.

构建合理的通勤交通体系对特大城市郊区居住新城的开发至关重要。

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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

Already, 75 percent of the world's 21 mega-cities are based in the developing world, and by some estimates, 27 of the 33 mega-cities expected to exist by 2015 will be in developing countries.

CNN: All About: Developing cities and pollution

With metropolitan cities of over 10 million people - so called "mega-cities" - on the increase, addressing prevention, response and reconstruction of the effects of natural risks was necessary, delegates said.

BBC: NEWS | Science/Nature | Losing sight of the countryside

As mega-cities become a reality and space becomes a premium, runways could be shortened to minimise land use.

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