7月19日,美航宇局发布了其“商业载人计划”第四阶段、也是最后一个阶段的招标书草案,称该计划仍打算在2017年底前让美国恢复从本土向国际空间站运送人员的能力。“商业载人计划”旨在资助商业厂家研制国际空间站人员往返运输系统。按照招标书草案,一旦该局下达载人飞行的首份任务订单,这些商业运输系统将会每年飞行两次。虽然本次竞标名义上是自由和公开的,但人们普遍认为取胜机会最大的还是该局正在“商业载人计划”第三阶段下提 On July 19, the U.S. Aeronautics and Space Administration released the draft bid for the fourth and final phase of its Commercial Manning Plan, saying the plan is still intended to allow the United States to resume its bid from the homeland to the International Space Station Ability to transport people. The Commercial Manning Program is designed to fund the commercial establishment of a shuttle service to and from the International Space Station. According to the draft tender, these commercial transport systems will fly twice a year once the agency releases the first mission order for manned flights. Although the bidding is nominally free and open, it is generally accepted that the chances of winning the most are still under the “Commercial Manned Project” phase 3