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假如我们所熟识的史前史全都是错误的呢？学者格雷厄姆·汉考克访问了世界各地的考古遗址，调查几千年前的文明是否比我们想象中要先进得多。。An in-depth look at the Democratic and Republican national conventions held during the 2008 U.S. Presidential election year.。