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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.
最終證明被抽干湖水的湖床并不是適應用來作建筑地基。如果你想要證據，那就看看墨西哥城一些最著名的標志性建筑。你可以到大都會大教堂里去看看，里面的地板是傾斜的，搖擺的鐘擺也是傾斜的，這證明整座教堂建筑都是傾斜的。沿著改革大道走下去，就來到了獨立天使紀念碑，由于這座于1910年建成的紀念碑下沉，所以政府建立了臺階。政府官員估計墨西哥城正以每年4厘米的速度下沉。政府最近出臺的一份報告估計60年來墨西哥城已下沉了10米。
