1. In audio, a very low frequency oscillation often resulting from a positive feedback path in an amplifier system. 
   在音响设备中出现的振荡频率极低的低频振荡，常因放大系统的正反馈回路引起。
2. a single pulsation of an oscillation produced by adding two waves of different frequencies; has a frequency equal to the difference between the two oscillations. 
   由两种不同频率的波合在一起所产生的每一次跳动；这种跳动的频率为原来两种波的频率的和或差。
3. cyclotron radiation and synchrotron radiation 
   回旋加速器辐射和同步加速器辐射
4. plasma oscillation in solids 
   固体中的等离子体振荡
5. electromagnetic oscillation and electric resonance 
   电磁振荡和电谐振

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