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. The service in that restaurant is extremely low. 
   那家餐厅的服务费非常低。

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• 1. 极低频
  extremely inverse relay 极端反时限继电器...extremely low frequency (elf ) 极低频...extremely low frequency antenna 极长波天线
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