通用从1957年开始销售聚碳酸酯以逐步取代玻璃和金属，它的应用非常广泛，从电子咖啡机到超音速飞行器的表面材料。
GE began selling Lexan in 1957. A potential replacement for glass and metal, it was used for everything from electric coffeemakers to the light covers on the wings of supersonic aircraft.
近年来，新一代的战斗机及新型的战略导弹对超音速、高超音速飞行的要求，引起了国内外许多研究人员对这一类流动的重视。
In recent years, the most of new fighters and strategic missiles require fly with supersonic or hypersonic speed, and this make a lot of researchers think much of this kinds of phenomena.
歼- 7靶机能以超音速飞行而且模拟现代战斗机的典型动作。
The Jian-7 target drone can fly at supersonic speed and simulate typical manoeuvres of modern combat aircraft.
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