When the DC waveform tries to drop back toward zero, the line voltage becomes less than the 20 volts the capacitor has been charged to.
当直流波形试图回落到零，线电压小于20伏的电容被充电到。
When the DC waveform tries to drop back toward zero, the line voltage becomes less than the 20 volts the capacitor has been charged to.
当直流波形试图回落到零，线电压小于20伏的电容被充电到。
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