To really know what makes a great city work,you have to ppel back its skin and expose its secret life force.A system of incredible complexity in technology of millions depend on ,but few understand.A fantastic voyage now begins a journey deep inside the world's megacities.
要真正知道什么使得这个伟大的城市工作,你必须深入剖析才能了解它的秘密MoOK8@dicMBmd4L。数以百万计的人依赖一个难以置信的复杂技术系统,但却很少有人知道Gen+_F@;h4RFlCTs。我们马上开始一段神奇的旅程DWv%vmI3-)lLB,r+t。

It's the world's biggest city.It covers more than 1400 square kilometers.Its population density is greater than New York City,Tokyo or London.But for the nearly 18 million people who live here it's not just another metropolis.Mexico City is grounds zero.On one side,one of the world's most earthquake-prone hot spots.On another,one of the world's most active volcanos and beneath their feet,the shaky foundation of an ancient lake bed.The mother nature,Mexico City is one big target, at any moment,the big one could heat.
这是世界上最大的城市=2([LEn4S;Ni~JF。占地面积1400多平方公里-+;1o~oOiiSQw.uU。它的人口密度远超纽约、东京或伦敦OF%M[yk_VZ。但是这里居住的近1800万人却不把它当做另一个大都市%ui|LP0)fCGup=t。墨西哥城才是其原点ybpZzBCY!l,)WqJ!U~。一方面,这里地震也最为频繁aphpR8^*RoP9%fmQH)oT。另一方面,世界上最活跃的火山就在城市居民的脚下，这里曾是古代湖床不稳定的基石77=ofYJY~-o。大自然赋予墨西哥城这座伟大的城市,在任何时刻都很伟大,大到炙手可热@==A12|VQgxNP。
From the instant the alarm sounds,they have just 60 seconds to reach safety.But the children of Mexico City,this drill may seem like funny games.But for the adults,it's deadly serious.In 1985 they lived through the real thing.

瞬间报警声音响起,他们只有60秒的时间转移到安全的地方lP[=.NMmRT9[foHMyNo。但墨西哥城的孩子们却好像在玩耍一样qN0!_LzNRe&。但是对于成年人来说,那是很严肃的问题AxMidlKt]|]X^RS1#Q*。在1985年他们经历过真实的事情P~Zueay%d(4。