1. Piezoelectricity type supersonic generator works actually using the resonance of piezocrystal.
   压电式超声波发生器实际上是利用压电晶体的谐振来工作的。
2. These planes travel at supersonic speeds.
   这些飞机以超音速的速度飞行。
3. Shell Aviation specially developed AeroShell Turbine Oil 555 lubricant for Rolls Royce for use in supersonic transport.
   这种航空润滑油是壳牌航空为罗尔斯·罗易斯公司生产的超音速飞机发动机专门研制的。
4. In gasdynamics and chemical lasers, the supersonic diffuser plays an important role in the pressure recovery system.
   在气动和化学强激光器系统研制中，压力恢复系统扩压器设计技术研究具有重要的工程应用价值。
5. The showcase, by running a small train, displays Doppler speed testing, materials detection, noise monitoring, supersonic distance testing, track weighing, and photoreader, etc.
   该展台用一个小火车运行来展示多普勒测速、材料探测、噪声检测、超声测距、轨道称重秤、光电计次等等。
6. The results show that the unstart boundary of supersonic inlets is mainly concerned with Mach number of freestream without considering the variation of angle of attack.
   在不考虑攻角变化的条件下，进气道不起动边界主要与来流马赫数有关。
7. On condition that the front body shape of the projectile is unchangeable,a formula is obtained for determining the relation between the optimum boattail angle and the supersonic flight region.
   在弹丸前体外形和外界大气密度不变的条件下，提出了利用弹丸炮口马赫数和顶点马赫数确定旋转弹丸最佳尾锥角的方法。

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