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Sorry,there is not text temporarily, Please help tingroom to look for it! 如果您能找到更好的听力原文，请发贴到听力原文收集区，您将会获得10到30积分的奖励! Thank you！

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VOA慢速英语2015 科学家测试太阳能动力

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VOA慢速英语2015 NASA Working Toward Mission to Mars

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美国国家公共电台 NPR New 'Basic Economy' Airfares May Not Be As Cheap As You Think

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