back up protection

• 后备保护

back up protection的用法和样例：

例句

1. With the results the article describes the advantage and importance of microprocessor-based phase spacing protection used as far-ranging back-up relaying of adjacent devices.
   通过计算分析剖析了微机相间距离保护用作相邻元件后备保护的优越性及重要性。