STANDING on the Hoover Dam and looking upstream at Lake Mead, America's largest reservoir, the visitor notices a wide, white band ringing the cliffs.
游客们站在胡佛水坝上朝上游的米德湖(美国最大的人造水库)望去会发现一条白色的宽条纹围绕着四周的岩壁。
For example, the Hoover Dam area experienced hundreds of quakes as Lake Mead filled.
比如说，胡佛水坝所在地区就曾经由于米德湖的满溢而经历了数百次的地震。
Las Vegas had similar problems. It was part of a great desert until Lake Mead was created by the Hoover Dam built on the Colorado River.
拉斯维加斯也有过同样的烦恼，在科罗拉多河建起胡佛大坝从而形成mead湖之前，拉斯维加斯一直是一片荒漠。
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