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SCIENCE STUDY

Speed of sound

作者:TEENS
Aa
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Air companies are always trying to make people’s trips faster. American Airlines now turns to supersonic airplanes (超音速飞机). In August, the company said they were going to buy 20 supersonic planes. They are called Overture. The US company Boom Technology will make them. Boom has planned 600 different routes (航线) across the world for the plane. 

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