单词：Charon vallis
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This is Scientific Americans 60-Second Science. Im John Matson, Got a minute? Imagine a pinball machine on multi-ball modeonly the balls are the size of planets. The early solar system was such a rough-and-tumble place. That chaotic environment produ
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THE MAKING OF A NATION - The American Civil War: An Anti-War Movement in the North Turns Violent By Frank Beardsley Broadcast: Thursday, April 07, 2005 (MUSIC) VOICE ONE: THE MAKING OF A NATION -- a p
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By Patricia Nunan in Kantale, Sri Lanka 24 August 2006 As many as 170,000 people in northern and eastern Sri Lanka have been displaced in recent weeks by fighting between the Tamil Tiger rebels and government forces. VOA's Patricia Nunan recently me
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By Jessica Berman Washington 22 February 2006 U.S. astronomers have discovered two moons orbiting Pluto, an icy planet smaller than our moon. Scientists found the moons while surveying the sky as part
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VOICE ONE: I'm Steve Ember. VOICE TWO: ''Revolt on the Amistad,'' silkscreen print by Jacob Lawrence And I'm Barbara Klein with EXPLORATIONS in VOA Special English. At the National Gallery of Art in W
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unit 409 报错电话号码（2） dialogue 英语情景对话 A:May I help you? A:可以为您效劳吗？ B:I'd like to place a person-to-person call to Mrs. tengvall in Sweden. B:我想打一个私人电话给瑞典的唐瓦夫人。 A:Could I hav
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