translation.en: The real key observation he made is that a free-flying wing can sweep through more sky and generate more power in a unit of time than a fixed-wing turbine.
translation.zh: 他做到的最关键的观察是 一个自由飞行翼可以扫过更多的天空和创造更多的能量 这是在一定的时间内和固定翼涡轮相比。