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　　突破孤立隔絕、僵化不變的史學(xué)成見，Henry Louis Gates Jr.博士講述從人類誕生到二十世紀(jì)，二十萬年來非洲的文明進(jìn)化。　　In his six-hour 3 part series, Africa's Great Civilizations, Henry Louis Gat

　　An in-depth look at the prison system in the United States and how it reveals the nation's history of racial inequality.