supersonic speed

China is now capable of building the world's first underwater vacuum tube train, a futuristic form of transportation that can achieve supersonic speed and reduce airborne noise, according to Chinese academics and scholars.

据中国的学者和学术研究人员表示，中国现在有能力建设世界上第一条水下真空管列车--这种未来的交通方式，其速度可以超过音速、且能大幅度降低噪音。

Some problems on the base flow of projectile at supersonic speed

关于超音速弹丸底部流动的若干问题

The parabolized stability equations ( PSEs) for high speed flows, especially supersonic and hypersonic flows, are derived and used to analyze the nonparallel boundary layer stability.

针对高速流动，特别是超声速和高超声速流动的非平行边界层稳定性问题进行了研究。

We need to work at supersonic speed to curb population growth, " he said. "

我们需要用 超音速 的行动来抑制人口增长.