论文部分内容阅读
航天技术正面临一场革命性的变化。美国国家航空航天局正在推进的X计划完全改变了航天飞机的起飞方式,新式航天飞机将以单级火箭的形式出现,它或许能实现人类自由出入太空的梦想。
Aerospace technology is facing a revolutionary change. NASA’s ongoing X program has completely changed the way the space shuttle departs. The new space shuttle will appear as a single-stage rocket that may allow humanity’s freedom to travel in and out of space.