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5. It's sinking
正在沉降
It turns out the dried-out bed of a biglake isn't the best foundation for building construction. If you want proof, take a look at some of Mexico City's most iconicstructures. The sloped floor and a swinging penduluminside the Metropolitan Cathedral show that the building is decidedly tilted. Head up Reforma Avenue to the Angel ofIndependence, and you'll need to walk up steps that the city built over theyears as the area around the 1910 monument sank. Government officials have estimated thatthe city is sinking at a rate of 10 centimeters (4 inches) per year. A recent government report (PDF) estimated that Mexico City has sunk 10meters (32.8 feet) in the past 60 years.
最终证明被抽干湖水的湖床并不是适应用来作建筑地基。如果你想要证据，那就看看墨西哥城一些最著名的标志性建筑。你可以到大都会大教堂里去看看，里面的地板是倾斜的，摇摆的钟摆也是倾斜的，这证明整座教堂建筑都是倾斜的。沿着改革大道走下去，就来到了独立天使纪念碑，由于这座于1910年建成的纪念碑下沉，所以政府建立了台阶。政府官员估计墨西哥城正以每年4厘米的速度下沉。政府最近出台的一份报告估计60年来墨西哥城已下沉了10米。
