拉森火山国家公园（位于美国加利福尼亚州）

EXPLORATIONS - Camping in America's National and State Parks

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Explorations

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VOA慢速英语2009年（九）月

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2012年VOA慢速英语(二)月

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VOICE ONE: I'm Faith Lapidus. VOICE TWO: And I'm Steve Ember with EXPLORATIONS in VOA Special English. Today, we explore some national parks of great beauty in the American West. (MUSIC) VOICE ONE: Millions of people from all over the world visit th

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VOA慢速英语2009年（四）月

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The director of US National Parks says more than 40 parks and wildlife refuges on the Gulf of Mexico could be affected by the BP oil spill. He said there is no clear end to the spill at this point but he downplayed the potential impact when the slick

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VOA标准英语2010年(五)月

2007年VOA标准英语-US National Parks Get Boost in Bush's Budget

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2007年VOA标准英语（二月）

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adsorption calorimetry