1. low frequency decrease load 
   低频减载
2. very low frequency measurement 
   甚低频测量
3. sky wave propagation for low frequency 
   低频天波传播
4. whistlers and very low frequency emissions 
   哨声和甚低频发射
5. It is the natural frequency of emission of the hydrogen atoms in space. 
   这是空间氢原子“释放”的自然频率。

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• 1. 超低頻放射
  超大型積體電路 extremely large scale integration，ELSI...超低頻放射 extremely low frequency emission...極低頻率，超低頻 extremely low frequency，ELF
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