high-voltage direct current (HVDC)的用法和樣例：
例句
- Commutation failures are one of the common faults in HVDC systems.
換相失敗是直流系統的最常見(jiàn)故障之一。 - It is highly non-uniform with the line end insulators bearing a higher voltage than that in an ac insulator string on dry condition.
乾燥情況下，直流系統絕緣子串電壓分布更加不均勻，導線(xiàn)端絕緣子電壓更高。
