1994年,美国NASA与国际伙伴已经确定将国际空间站的建造分作三个阶段实施,最终将于2002年结束,达到长期载人能力。 第一阶段为美俄扩大联合载人航天活动期,利用俄罗斯现有的“和平”号空间站获取航天员在空间长期进行生命科学、微重力材料科学和对地观测的经验,以及航天飞机与空间站在空间交会对接的技术,降低国 In 1994, the United States NASA and its international partners have determined that the construction of the International Space Station will be divided into three phases and will eventually be completed in 2002 to achieve long-term manned capacity. In the first phase, the United States and Russia expanded the period of joint manned space activities and used the existing space station “Peace” of Russia to acquire long-term experience of astronauts in life sciences, microgravity materials science and earth observation in space as well as space shuttle and space station The rendezvous and docking technology in space, reduce the country