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托福TPO-43 Lecture 4-2

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so they, like other types of electromagnetic wave, can travel basically anywhere, through a vacuum, or through atmosphere or water.

所以它们,和其他类型的电磁波一样,基本上可以在任何地方穿梭,可以穿过真空环境或者空气或水。
Now, radio waves can be detected. For example, very low frequency radio waves can be detected with a special type of radio receiver
无线电波是可以探测到的。比如说,很低频次的无线电波可以用一种特别类型的无线电接收器探测到,
called a very low frequency radio or VLF radio, which can pick radio waves with very low frequencies, from 3 to 30 kilohertz,
这种接收器叫做非常低频次的无线电接收装置或VLF无线电装置,它能接收到很长低频次的无线电波,从3千赫到30千赫,
which aren’t really picked up by a regular household or car radio.
这个范围内的无线电波不会被寻常家用的或车载无线电装置接收到。
So VLF radios pick VLF radio waves and convert them to sounds we can hear.
所以VLF无线电装置会接收到VLF无线电波,并且把它们转变成我们能听到的声音。
Um, on Earth, the main source of naturally occurring VLF emission is lightning, which generates a pulse of radio waves every time it flashes. Yes, Laura.
在地球上,自然释放VLF的主要来源是闪电,它每一次闪现时会产生一个脉冲的无线电波。Laura,请讲。
Since you almost always get lightning with thunderstorms. We can pick up VLF waves pretty often, right?
既然在雷暴中几乎总是会有闪电,那我们可以经常接收到VLF电波,对吗?
You just have to wait until there is a thunderstorm.
你只需要等到有雷暴就行了。
Ah, do you? Have to wait? VLF receivers are very sensitive and VLF waves travel very far.
是吗?要等吗?VLF接收器非常敏感,而且VLF电波传播得非常远。
So you can pick up emission from lightning that’s far away.
所以你从很远的地方就能接收到闪电释放的电波。

重点单词   查看全部解释    
vacuum ['vækjuəm]

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n. 真空,空间,真空吸尘器
adj. 真空的

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lightning ['laitniŋ]

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n. 闪电
adj. 闪电般的,快速的

 
frequency ['fri:kwənsi]

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n. 频繁,频率

 
sensitive ['sensitiv]

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adj. 敏感的,灵敏的,易受伤害的,感光的,善解人意的

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source [sɔ:s]

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n. 发源地,来源,原始资料

 
convert ['kɔnvə:t,kən'və:t]

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v. 变换,(使)转变,使 ... 改变信仰,倒置,兑换

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