19,这波浪形的砂岩构造位于美国亚利桑那州(state of arizona)和犹他
mystery"stone wave" at the border between utah and arizona.
33 unbelievable places to visit before you die | worldtruth.tv
报道| 乔姆斯基受聘亚利桑那大学
since 2000, the world has seen extreme poverty more than halved.
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