And if you go over the next 15 years or so to a blended-wing body, kind of a flying wing with internal engines, then you get about a factor three efficiency improvement at comparable or lower cost.
如果你仔细审视一下未来15年，或者是所谓的混合翼结构 就是那种有内置引擎的机翼 那么你就有可能以相对较低的成本 把你的效益提高三倍