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美国正在进行一项投资30亿美元的研究工作,以便制造空天飞机,这种飞机可从普通跑道起飞,达到M25速度,飞进空间。不过,法国、英国和德国的小组正在提出不同于美国设计的给人印象深刻的可供选择的方案。
The United States is conducting a $ 3 billion investment in research to produce a space shuttle that takes off from normal runways and reaches M25 speed and flies into space. However, groups in France, the United Kingdom and Germany are presenting impressive alternatives to the U.S. design.