新型超音速飞机即将问世，从纽约到伦敦只需3小时

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新一代超音速飞机解决了音爆问题可以广泛使用，这一使用将使得航程大大缩短。

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NASA might be famous for sending rockets up to space quickly. But it could be making your next holiday come more quickly, too.

The space agency is working on a new plane that could solve the problems of traditional supersonic(超音速的) flight and greatly increase the speed of journeys abroad. If successful, the plane would be able to fly between New York and London in just three hours. And it would halve the time spent flying other journeys, since it could be used more widely.

Until now, the problem with such planes has been the noise. That happens when a plane reaches supersonic speeds. The noise upsets people on the ground, making animals feel uneasy and even causing physical damages to materials and houses on the ground. So such planes are banned from flying over the US land.

The space agency has successfully tried out the technology, and now believes that it could be put to commercial use. That plane will fly as high as 55,000 feet, far higher than normal planes and make a sound of only 60 decibels(分贝). That's far less than the 90 decibels thrown out by a traditional supersonic plane, and is almost in line with a car on the highway or a busy restaurant.