由于地下输电系统的修理时间较长，因此有时就安装双套重复设施以降低重叠停电的危险。

Because of the longer repair time for underground transmission systems, expensive duplication facilities are sometimes installed to reduce the risk of overlap-ping outages4.

youdao

由于地下输电系统的修理时间较长，因此有时就安装双套重复设施以降低重叠停电的危险。

Because of the longer repair time for underground transmission systems, expensive duplication facilities are sometimes installed to reduce the risk of overlap-ping outages4.

youdao