肯尼迪讲话50周年正值美国太空政策的困难时期。
And yet the jubilee of the Kennedy speech comes at a difficult time for American space policy.
《空间政策指令3》为美国制定了一般性指南，以减轻空间碎片的影响以及跟踪和管理太空交通。
Space Policy Directive-3 lays out general guidelines for the United States to mitigate the effects of space debris and track and manage traffic in space.
花旗银行曾在1993由美国盛世公司接管，以首创汽车贷款政策、太空旅游政策和商业飞机航线政策而闻名世界。
This company was taken over in 1993 by Primerica and is world renowned for being the first- automobile policy, space travel policy as well as commercial airline policy.
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