Even if ET has mastered building a rocket that can travel at the speed of light, he may be lying dead inside a weakened craft .
即使外星人已经掌握了制造一枚能以光速飞行的火箭的技术，他也可能死在了一架飞船里。
Signals travel at the speed of light.
信号以光的速度传播。
Radio waves also travel at the speed of light.
无线电波也是以光速传播的。
Since x-rays travel at the speed of light, the echo indicates that an object fell into the black hole around 350 years ago.
因为X射线以光速运行，因此反射表明，大约在350光年前，有一个物质落入黑洞。
As we learned in school, radio signals all travel at the speed of light, but this is literally true only in an absolute vacuum.
我们在学校里边知道了无线电信号都是以光速行进的，但是这句话只有在完全的真空中才是完全正确的。
According to Einstein, this means they necessarily travel at the speed of light-and, as a consequence, do not experience the flow of time.
据爱因斯坦，这表示它们必然以光速行进—而且，由于光速运动，它们不会经历时间的流逝。
Even if ET has mastered building a rocket that can travel at the speed of light, he may be lying dead inside a weakened craft whose navigation systems have short-circuited.
即使ET已经掌握能够光速航行的火箭技术，他也可能已横尸于损坏的飞船之中，它的航行系统已经短路。
In a vacuum they all travel at the speed of light; they are all composed of electric and magnetic vectors which are perpendicular to each other; they are all quantized as photons, and so on.
在真空中，它们都以光速前进；它们都由彼此垂直的电磁矢量构成；它们都可以用光子来量化，等等。
Radio waves also travel at the speed of light, and assuming such an automatic messenger picked up our first broadcasts of the 1920's, the message to its home planet is barely halfway there.
无线电波传播速度同光速一样，假设这种信使接收到我们于本世纪20年代的初次广播，则送往其母行星的信息现在仅走过一半路程。
The aeroplane will travel at twice the speed of sound.
飞机将以两倍于音速的速度飞行。
Today people and goods travel by jet aircraft and fast ships, and information is transmitted at the speed of light over the Internet.
人和货物通过喷气式飞机和快船来流动，而信息是通过互联网以光的速度传送。
Even with today's radio equipment, the messages will take minutes-sometimes hours-on their journey, because radio and light waves travel at the same limited speed of 186, 000 miles a second.
即使有今天的无线电设备，信息传播也需要好几分钟，有时候甚至好几个小时，因为无线电和光波都是以每秒186,000英里的有限速度传播。
It will, however, travel between the two cities at less than full tilt, at an average speed of 350 km per hour.
然而，当在上述两个城市之间运行时，它不会满负荷工作，而是会把时速控制在平均350公里每小时。
A few feet from the cycling lane traffic moves at speeds of between 30 miles per hour, the speed limit for arterials in Seattle, and 40 miles per hour, the speed at which many cars actually travel.
自行车车道离机动车道仅有几英尺，机动车规定速度必须保持在每小时30英里，这是在西雅图干道上的速度限制，但实际上许多车辆都是以每小时40英里的速度行驶的。
They are very nearly massless and thus, even at moderate energies, we'd expect them to travel essentially at the speed of light.
它们的质量非常接近零，因此，即使在中等能量下，我们也希望它们以光速传播。
The K21 can travel as fast as 70 kilometers per hour on paved roads and cross a river at a speed of 7.8 kilometers per hour with the help of its water-jet propulsion system.
K21可以以每小时70公里的速度在铺设的道路上行驶，喷气推进系统能每小时加速7.8公里，以这速度可以穿越过一条河流。
The boat will travel at at an average speed of 7.5 knots — about the same as an oil-tanker.
这只船的平均航行速度是7.5节，和油轮的速度大致相同。
First is free flow in which the density of traffic is low enough to allow vehicles to travel at the maximum speed allowed.
首先是畅通无阻，交通密度足够低，使得车辆能以最高时速行驶。
And so the center of mass will just laugh at us and ignore all these motions and will travel at a constant speed very nicely.
重心会嘲笑我们，它忽略所有运动，它会匀速运动。
Although previous studies have found that the "group velocity" of light can travel faster than c, the "signal velocity" - the speed at which information travels - cannot.
尽管先前的研究已经证实，光的“群速度”可以超越光速c，而“信号传播速度”——光携带的信息的传播速度——不能超越光速。
Although previous studies have found that the "group velocity" of light can travel faster than c, the "signal velocity" -the speed at which information travels -cannot.
尽管先前的研究已经证实，光的“群速度”可以超越光速c，而“信号传播速度”——光携带的信息的传播速度——不能超越光速。
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。
For a crew to make the 50, 000-light-year journey to the centre of the Milky Way within 10 years, they would have to travel at 99.999998 per cent the speed of light.
要在10年内飞行50000光年到达银河系中心，飞船速度必须达到光速的99.999998%。
These cars will then travel alongside to match the speed of the wheel at the bottom of its rotation so passengers can transfer in and out of the cars.
这些车辆届时将在摩天轮旋转到底端的时候在旁边与其同速行驶，以便乘客可以进入或者走出这些车辆。
If the electron flow takes place in a vacuum, as in the case of electronic valve, the electrons will travel at considerable speed, since little resistance is offered the medium.
如果电子在真空里流动，比如电子真空管，那么电子的运行速度非常快，因为介质对电子几乎不产生什么阻力。
Though all types of electromagnetic radiation travel at the same speed, they vary in frequency and wavelength, and interact with matter differently.
虽然所有形式的电磁波都以同一速率行进，但在频率和波长方面各不相同，并与物质有不同的交互作用。
You should travel at a safe speed relative to the motion of the other vehicles on the road.
你应该使用一个对于道路上其他车辆相对安全的速度行驶。
You should travel at a safe speed relative to the motion of the other vehicles on the road.
你应该使用一个对于道路上其他车辆相对安全的速度行驶。
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