频率波动
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difference frequency fluctuation 差频起伏
frequency difference fluctuation
频差波动
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Pressure difference and Cd concentration fluctuation may cause the noise to increase many times with the latter mainly enhancing the noise in the low frequency range.
气压差及镉浓度波可使噪音增大很多倍，浓度波主要增强了低频噪音。
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