Until now, the problem with such planes has been the sonic boom, made famous by the original Concorde. That happens when a plane reaches supersonic speeds.

目前为止，超音速飞机始终存在音爆问题，当飞机的速度超过音速时，就会发生音爆。初代协和式飞机就让人们普遍认识到这点。

It is a thunderous noise that upsets people on the ground – disturbing livestock and even causing physical problems to materials and houses underneath. It was irritation with that effect that led Congress to ban such planes from being used over US land, a decision that in turn was partly responsible for Concorde failing to be commercially viable and getting mothballed.

音爆是一种雷鸣般的噪音，它让地面上的人牲感到不适，甚至还会对物体和房屋造成物理伤害。正是这些负面影响引发的不满导致美国国会禁止了超音速飞机在美国国内飞行，这个决定继而部分导致了协和式飞机不能继续商用，最终停飞。

The space agency has successfully tried out the technology in wind tunnels, and now believes that it could be put to commercial use. It now wants to test that out by having commercial companies build a version of the plane that could be put to use.

美国宇航局已经在风洞里成功测试了相关技术并相信可以将其运用在商业飞行中，他们现在希望由商业公司制造一架可以投入使用的飞机以进行试飞。

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