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日前,美国国家航空宇宙航行局(NASA)计划建造新型航天器,并于2010年取代现有航天飞机。 NASA宇宙太空站和航天飞机的负责人认为,对于近期和未来宇航事业的发展,航天飞行器的维修和更新是至关重要的。宇航飞机在过去22年
NASA plans to build a new spacecraft and replace the existing space shuttle by 2010. The heads of the NASA space station and the shuttle believe that maintenance and renewal of the spacecraft are crucial to the development of the near-term and future aerospace industries. Aerospace aircraft over the past 22 years