例句與造句

1. The reasons why reverse current protection is not necessary in rectifiers of direct current traction substation are described
   摘要通過分析，闡述了直流牽引變電所內(nèi)的整流器不必設置逆流保護的理由。
2. It's difficult to find reverse current protection in a sentence. 用reverse current protection造句挺難的