Repetitive voltage fluctuations cause brightness variations in incandescent elements.

反复的电压波动引起白炽灯光度的变化。

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Thus, dc voltage fluctuations are maintained within the small range of the voltage margin.

直流电压变化会维持在一个很小的范围内。

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Power supply voltage fluctuations must be within the allowable range, and remain relatively stable.

电源电压波动必须在允许范围内，并且保持相对稳定。

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The hard drive circuits translate those signals into to voltage fluctuations.

硬盘电路板把这些信号,转化为电压波动。

哈佛公开课 - 计算机科学课程节选