音速

For decades, researchers have dreamed of building hypersonic aircraft that could whip around the world in just a few hours.

几十年来，研究人员一直梦想着制造出在几个小时内就能绕地球飞行一圈的超高音速飞行器。

CNN -- Fifty-seven years after combat pilot Chuck Yeager broke the sound barrier, NASA will make a second attempt Saturday at flying an aircraft at 5,000 mph -- about seven times Mach 1, the speed of sound.

现在，NASA(美国国家航空和宇宙航行局)将于周六进行时速5000英里的喷气式飞机的第二次试飞，这个速度大约为音速的7倍----7马赫。

CNN -- Fifty-seven years after combat pilot Chuck Yeager broke the sound barrier, NASA will make a second attempt Saturday at flying an aircraft at 5,000 mph -- about seven times Mach 1, the speed of sound.

57年前，战斗机飞行员Chuck Yeager首次突破了音障。现在，NASA(美国国家航空和宇宙航行局)将于周六进行时速5000英里的喷气式飞机的第二次试飞，这个速度大约为音速的7倍----7马赫。

The missile uses active radar homing and is powered by a turbojet. The anti-ship missile has a range of 120km and approaches the target in sea skimming mode at a speed of 0.9 Mach. The 165kg shaped charge warhead has time delayed impact proximity fuses.

导弹使用主动雷达制导，由涡喷发动机推进（还有一个固体火箭助推器），射程120千米，在掠海模式下攻击速度0.9倍音速。165千克的成型装药战斗部装有延时触发引信。

Mach'.'' 2, it is flying at twice the speed of sound.

假如飞机以二马赫的速度飞行，那么它的速度就是音速的两倍。

And sonically, I think the record is very special.

而且从音速来看，我认为这张专辑很特别。

Several useful computer codes for analysing 2—D and 3—D transonic flow past bodies of revolution, fuselage configurations and highly swept wings have been developed in different types of grid topologies according to Holst's highly efficient AF2 algorithm of finite difference method.

九、研制了一整套在不同网格拓扑上用于分析旋成体、任意截面机身、以及大后掠细长机翼跨音速气动特性的实用程序。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。