Whether supersonic commercial aviation really will work this time should thus be clear by the mid 2020s.
【正确答案】：因此,到21世纪20年代中期,超音速商用航空这次是否真的行得通就应该清楚了。
Whether supersonic commercial aviation really will work this tim
📱 扫码体验刷题小程序
扫一扫使用我们的微信小程序