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Take a closer look at how much worse it can be for people living in cities. 80 million Americans live in the cities with populations of more than 100,000 and it's common for the downtown areas of thos

发表于:2018-12-11 / 阅读(75) / 评论(0)

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发表于:2018-12-28 / 阅读(46) / 评论(0)

舌尖上的中国第一季

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EXPLORATIONS - A Sticky Black Hole of Ancient Death, Right in the Middle of Los AngelesBy Paul Thompson Broadcast: Wednesday, April 26, 2006 (MUSIC) VOICE ONE: This is Faith Lapidus. VOICE TWO: And th

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EXPLORATIONS - La Brea Tar Pits

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VOICE ONE: I'm Shirley Griffith. VOICE TWO: And I'm Steve Ember with EXPLORATIONS in VOA Special English. Today we tell about an unusual scientific research area in the United States. It is filled with the remains of ancient animals. This unusual pl

发表于:2019-01-11 / 阅读(60) / 评论(0)

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发表于:2019-02-03 / 阅读(90) / 评论(0)

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average linkage clustering

centrifugal mechanism