17. To avoid interferences, and keep the telescopes sensitive, radio telescopes are built in places where there are no human radiowaves or electronic signals.
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。
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18. Unlike visible light waves, these radiowaves can get through the various gases and dusts in space, and through our own earth's atmosphere comparatively easily.
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。
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19. Some very important discoveries have been made by this technology, especially you consider that some objects in space give off radiowaves but don't emit any light.
20. A receiver and amplifier receive the radio waves from the sub reflector, and make these weak radiowaves strong enough to be recorded and turned into electronic signals.
21. Most antennas are made in the shape of a dish to collect and reflect the radiowaves to the sub reflector, in the same way as a curved mirror focuses visible light to one point.
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。
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22. The extension of astronomy from visible light to radiowaves to x-rays and gamma rays never failed to lead to the discovery of unusual objects such as radio galaxies, quasars, and pulsars.