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用航天飞机将负荷送上太空的费用是相当昂贵的,现在科学家们正在研制一种叫做汾丘星的空间运输系统,它的预定费用是每磅一千美元,这是租用航天飞机价格的十分之一。为了获取经费资助,汾丘星有了一个原型X-33。