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新奇事件簿(翻译+字幕+讲解):地球两磁极将要开始转动

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When doom-and-gloom merchants warn us about threats to our existence, we usually hear about climate change, asteroid strikes or nuclear war. Now scientists have warned of the potential threat from Earth's magnetic poles flipping upside down. The North Pole and South Pole are responsible for creating a special barrier around Earth that protects us from killer radiation from space. All life on Earth depends on this shield. Without it, scientists say solar rays could cause considerable damage. The poles could flip in the next thousand years. This is because a rolling layer of liquid iron under the earth's crust is changing direction. The revolving currents of this molten iron at Earth's center act as a gigantic electromagnet.

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地球两磁极将要开始转动
Historically, Earth's North and South magnetic poles have flipped every 200,000 to 300,000 years. The last time was 780,000 years ago, so the next flip is well overdue. Some scientists say the flip could destroy satellite communications and power grids; that dangerous solar rays would greatly multiply rates of cancer; and that climate change could kill billions of creatures. Some scientists forewarn that a polar flip could even blow Earth's atmosphere away. However, one scientist dismissed the doom-mongers. He believes that the effects of any increase in radiation would be as harmful as lying on a hot beach for a day. He suggested a "floppy hat" would be enough to protect us from any increased radiation.

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重点单词   查看全部解释    
multiply ['mʌltiplai]

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vt. 乘,增加
vi. 扩大,繁衍,做乘法<

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pole [pəul]

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n. 杆,柱,极点
v. (用杆)支撑

 
flip [flip]

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vt. 掷,弹,轻击
vi. 翻转

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shield ['ʃi:ld]

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n. 盾,防卫物,盾状物
vt. 保护,遮蔽

 
radiation [.reidi'eiʃən]

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n. 辐射,放射线

 
potential [pə'tenʃəl]

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adj. 可能的,潜在的
n. 潜力,潜能

 
considerable [kən'sidərəbl]

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adj. 相当大的,可观的,重要的

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liquid ['likwid]

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adj. 液体的,液态的
n. 液体

 
layer ['leiə]

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n. 层
vi. 分层
vt. 将某

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magnetic [mæg'netik]

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adj. 有磁性的,有吸引力的,催眠术的

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关键字: 地球两极 转动

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