也发现即使三相输入电压平衡，输入电流也存在失真现象。
It is found that the input current produces distortion even if the three-phase input voltages are balanced.
传统方法一般用圆卷积和对称扩展方法来减弱边界扩展效应，但实验结果表明边界还存在失真。
Though the conventional symmetric extension and circular convolution are applied, the experiments show that the border distortion still exists in the reconstructed signal.
另外，由于同居但不结婚的现象比较普遍，排行榜的结果可能也存在失真，导致统计数据中的“单身”数量增多，而这些人 实际上并不是单身。
What is more, the prevalence of couples who live together but aren't married may also distort the results, creating higher numbers of 'singles' in the stats who aren't really singles.
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