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早在六十年代,美国空军就有一项超声速巡航冲压式喷气发动机(scramjet)的研究计划,据专家分析,这项计划至少有以下两种潜在的用途: 一是装备机动的高超声速机群,其战略
As early as the 1960s, the U.S. Air Force had a research program for the supersonic cruise ramjet scramjet. According to expert analysis, there are at least two potential uses for this program. One is to equip a mobile hypersonic fleet with strategy