Therefore it can be seen that it will "smooth" the "twice mains frequency DC" into a near constant DC voltage.

因此它可以把“两倍于电源频率的直流电”进行“平滑化处理”，成为一个接近恒定的直流电。

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This is basically a reading of how efficient the PSU is at turning AC mains voltage into DC for your PC.

这基本上是一个如何在高效率的电源供应器变成直流电源为您的PC交流电压读数。

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