I would add an additional source of pernicious distortion: the median household depicted on popular TV dramas is outrageously wealthy, compared to the median American household in real life.

我想指出另一个有害的扭曲事实的源头：相对于现实中的美国中产阶级家庭，电视剧里的中产阶级家庭富有的有些夸张。

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Additional negative feedback is provided to set loop gain to unity at the oscillation frequency, to stabilize the frequency of oscillation, and to reduce harmonic distortion.

为了使振荡频率稳定并降低谐波失真，需要加入一个在震荡频率处能够提供单位增益的负反馈路径。

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However, the utility source for a plant may contain additional harmonic voltage distortion arising from external sources.

然而，对工厂实用电源可能包括由外部电源引起的额外的谐波电压畸变量。

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