求翻译：为争夺技术霸权和军备竞赛的需要，美国 曾提出多个超高因素飞行器发展计划，如“空天飞机”计划等，但因存在技术，经费和管理等难题而中途夭折。然而，由于关键技术 不断取得新突破和需求牵引，美国对超高音速飞机计划不断做出调整，确立了分阶段逐步发展思路， 并选择巡航导弹作为突破口， 而后转入其他飞行器及天地往返运输系统。是什么意思？

Competition for technological supremacy and the need for an arms race in the United States has raised a number of factors, high aircraft development programs, such as "space plane" programs, but there are technical, financial and management problems and abortive. However, due to continue to achieve

The quest for technological hegemony and the arms race, the United States has raised a number of needs an ultra-high factor aircraft development programs, such as "space plane" scheme, and so on, but because of the existence, such as technical, financial and management problems and abort. However, t

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To fight over the technology needs of hegemony and the arms race, United States aircraft development plan had a number of super high factors, such as "space plane" scheme, but because of technical, financial and management problems and die on the vine. However, due to constantly achieve new breakthr

To fight for the needs of technological hegemony and arms race, U.S.A. has proposed a p