今天，商用飞机主要靠把从喷气式引擎排出的热空气引导到机翼的边缘，使它们变暖，以此来达到除冰的目的。
Today, commercial aircraft remove ice that accumulates on wings in-flight by redirecting hot air from the jet engines to the leading edge of the wings to keep them warm.
在1961年，美国制造商Convair生产出了可以达到0.91马赫的商用喷气式飞机，速度相当于声音传播速度91%。
In 1961, American manufacturer Convair released a commercial jet that could reach Mach 0.91, meaning 91 percent as fast as sound.
这看起来象一张从飞机上拍摄的照片，除非有人记得他特地乘商用喷气机飞越过这个最高峰就是在这个高度。
It might look like a photo taken from an airplane, until one remembers the summits are at the height typically flown by commercial jets.
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