But even if they make it to market soon, don't expect to be zipping around the country at the speed of sound.
即使这些飞机很快的投入市场，也不要期待以音速飞行的飞机可以在国家间呼啸而过。
And the reason we don't notice all this emptiness is because air molecules are constantly moving around at the speed of sound, and bouncing against any surface that happens to fall in their path.
我们没有注意到这一点的原因是空气分子以音速在不停地移动，而当它们碰到任何表面时都会反弹回去。
In 1997 at Black Rock Desert, Nevada, he drove Thrust SSC to become the first person to break the sound barrier in a car and set the existing land-speed record of 763mph.
1997年在内华达州黑岩沙漠，他驾驶“推进”号超音速车成为突破汽车音障的第一人，并创下目前时速763英里的地面速度记录。
As myriad technologies mature, new sorts of aircraft become possible. Unmanned aircraft have flown at more than five times the speed of sound.
因为诸多技术已经成熟，新型飞机问世不是没有可能，无人机能以五倍音速以上巡航。
They found that at the lower speed sound levels regularly exceeded 88db, the equivalent of a diesel train passing or a construction site.
他们发现汽车低速行驶的时候，噪音水平通常超过88分贝，这个数值与柴油机车经过时或是建筑工地的噪音水平相当。
Slower cruising — at about Mach 0.7, or seven-tenths the speed of sound, which is 5 percent to 10 percent slower than today's aircraft — and at higher altitudes, to save fuel.
更低速的巡航——大约0.7马赫，即音速的十分之七，比今天的飞行器低5 - 10%——并且飞行于更高海拔以节约燃油。
That staging point is expected to come at about the 124-second mark, when the supersonic Ares I-X rocket is traveling Mach 4.7? More than four times the speed of sound, its Max speed for the flight.
分离时刻预计在124秒时，这时超音速火箭战神i - X以4.7马赫的速度飞行——这是音速的四倍，也是飞行的最高速度。
And to make matters worse for the pilot, as the tips of the rotor blades approach the speed of sound (around 1,200kph at lower altitude temperatures), shock waves produce huge vibrations.
这种情况对飞行员来说很糟，因为螺旋桨的尖部接近声速(在海拔较低的温度下大约1200kph)，冲击波造成强烈震动。
However, the flight still managed to return 139 seconds of aerodynamic data at a velocity between 17 and 22 times the speed of sound, Darpa said.
然而，Darpa表示，在以17到22倍音速飞行的状态下，飞机还是回传了139秒的空气动力学数据。
The shape of the Super Hornet, which can travel at up to 1, 370mph - 1.8 times the speed of sound - encourages the cone to form.
超级大黄蜂的最高时速可以达到1370英里每小时（2205公里/小时），这个速度是音速的1.8倍。 如此之高的飞行速度和它的外形设计使超级大黄蜂易于形成蒸汽锥。
One of the primary attributes of deflagration is that the flame travels at a speed significantly lower than the speed of sound.
对爆燃的主要特征之一，是火焰的速度大大低于音速的降低旅行。
The flow induced oscillation in a cavity exposed to external high speed flow and its suppression by means of sound excitation at the leading edge of the cavity are experimentally studied.
实验研究了矩形空腔在外部高速气流作用下诱导的空腔内流动振荡问题，以及从空腔前缘加入纯音声激励以抑制空腔内流动振荡的技术。
The right calcaneus speed of sound decreased significantly at the age of 41-50 years in male, and at 51-60 years in female.
男性右跟骨超声声速值出现明显下降的年龄是41～50岁，女性出现明显下降的年龄是51～60岁。
BAC's supersonic jet was capable of twice the speed of sound and beautiful to look at too.
法国宇航公司与美国的超音速客机能够两倍音速和美丽看太多。
Aerospatiale and BAC's supersonic jet was capable of twice the speed of sound and beautiful to look at too.
法国宇航公司与美国的超音速客机能够两倍音速和美丽看太多。
Flow velocity, at this location, can never exceed the local speed of sound, and is said to be in a choked condition.
流速，在这个位置，绝不能超过当地音速的，据说是在一个呛条件。
The agency has plans for another 11-second hypersonic flight, this time at 10 times the speed of the sound.
美国国家航空航天局计划进行再一次的11秒超音速试飞，这次会以10倍于音速的速度进行。
It comes equipped with a sound effect function, a new mirror face, high speed song search at 36 times the normal speed and 62 hours of continuous playback.
它具有音效功能，新型的镜面设计，36倍速的高速歌曲搜寻和62小时的持续回放。
The mike recorded my clap and the echo after about 6 ms--giving about 320 m/s--very close to the correct value for the speed of sound at standard conditions.
麦克风在大约6秒后记录到了我的拍手声和回声--给出的值为320m/s--非常接近在标准条件下的正确音速值。
Deflagration is combustion wave propagating at a velocity less than the speed of sound.
爆燃过程是一种以低于音速而传播的燃烧波。
Where is the swelling? Being shot is like getting hit by a hammer, but at twice the speed of sound. Have you ever hit yourself on the finger with a hammer?
也没有看到肿胀。因为枪伤的伤口会像被一个2倍音速的榔头敲打过一样…你有没有被铁槌不小心敲过？
Skylon will take off from a standard airport runway and travel at more than five times the speed of sound.
“云霄塔”将可以从一个标准机场跑道起飞，然后以高于5倍音速的速度飞行。
Skylon will take off from a standard airport runway and travel at more than five times the speed of sound.
“云霄塔”将可以从一个标准机场跑道起飞，然后以高于5倍音速的速度飞行。
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