已被搁置多年的超音速民航客机概念是否会再次复苏？
Might the idea of near-hypersonic passenger aircraft, which has lain dormant for a few years, be coming back?
但是波音公司项目经理乔•沃格尔说，超音速飞机在技术上已经取得了重大突破，他预计超然冲压发动机将来也可能会应用到民航客机上。
But Joe Vogel, the project manager at Boeing, says the technology has “crossed over the threshold” into hypersonic flight. He reckons that scramjets might one day power civilian aircraft.
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