电波传来了一个大家熟悉的声音。
愈来愈多的电视台和广播电台使无线电波段愈来愈拥挤。
More and more TV and radio stations are crowding the airwaves.
他们的仪器探测到了频率为3千赫的非常微弱的无线电波。
Their instruments detected very faint radio waves at a frequency of 3 kilohertz.
这场竞选大战不是在街头集会中进行，而是在无线电波中交锋。
The election campaign has been fought not in street rallies but on the airwaves.
有规律的重复活动如声波、光波、无线电波都有一个特定的频率，或者说是每秒的波动次数。
Regular repeating actions such as sound waves, light waves, or radio waves have a certain frequency, or number of waves per second.
我们把来自太空的无线电波变成了光。
我们向全球发射无线电波。
无线电波是一种我们看不见的电磁辐射。
宇宙中的许多物体是看不见的，但它们发射无线电波。
Many objects in the universe are invisible, but they send radio waves.
如果无线电波真的能够穿透宇宙空间的话，它有什么问题呢？
If the radio waves are so good at getting through the universe, what's the problem?
他们发射那些可以反射雨滴、飞机、蝙蝠以及其他东西的无线电波。
They send out radio waves that reflect off raindrops, airplanes, bats, and so forth.
电波望远镜就这样出现了，它被认为是二十世纪最伟大的发明之一。
The radio telescope thus appeared, and it is considered one of the greatest inventions in the twentieth century.
蝙蝠“雷达”这个用语在技术上是错误的，因为它们不使用无线电波。
It is technically incorrect to talk about bat "radar", since they do not use radio waves.
无线电波的波长比可见光长得多，而且来自深空的无线电波总是很弱。
Radio wavelengths are much longer than those of visible light, and the radio waves from deep space are always weak.
马可尼是第一个开发出利用无线电波进行无线电报传输的有效方法的人。
Marconi was the first to develop a practical method for wireless telegraphy using radio waves.
电波望远镜就像一只耳朵，从宇宙的白噪音中分辨出有意义的无线电信息。
The radio telescope is like an ear, listening to tell meaningful radio messages from white noise in the universe.
一个问题是，来自这些遥远物体的无线电波，即使可以到达这里，也会非常微弱。
One problem is that radio waves from these far away objects, even though they can get through, are extremely faint.
为了避免干扰，保持望远镜的灵敏度，无线电望远镜被建在没有人为的无线电波或电子信号的地方。
To avoid interferences, and keep the telescopes sensitive, radio telescopes are built in places where there are no human radio waves or electronic signals.
大多数天线被制成碟形，用以收集和反射无线电波至亚反射器，就像曲面镜将可见光聚焦于一点一样。
Most antennas are made in the shape of a dish to collect and reflect the radio waves to the sub reflector, in the same way as a curved mirror focuses visible light to one point.
与可见光波不同的是，这些无线电波可以较容易地穿过太空中的各种气体和灰尘，穿过我们地球的大气层。
Unlike visible light waves, these radio waves can get through the various gases and dusts in space, and through our own earth's atmosphere comparatively easily.
运用这项技术后，已取得了一些非常重要的发现，尤其是考虑到太空中的一些物体会发出无线电波，但不会发出任何光。
Some very important discoveries have been made by this technology, especially you consider that some objects in space give off radio waves but don't emit any light.
从可见光扩展到无线电波，再到X 射线和伽马射线，天文学总是会发现不寻常的物体，如射电星系、类星体和脉冲星。
The extension of astronomy from visible light to radio waves to x-rays and gamma rays never failed to lead to the discovery of unusual objects such as radio galaxies, quasars, and pulsars.
访谈通过无线电波传了出去。
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