voltage fluctuation waveform
电压波动波形
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频率“通常是指空气粒子来回运动的速率或者电压的波动，所以它能代表一个规则波形曲线上下波动的节律。”
"Frequency" just means the rate at which air molecules go back and forth, or a voltage fluctuates, and it can be represented as the rate at which a regular squiggle goes up and down.
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