single-wire line

例句：

1. 1. The single-wire line is the only way to reach the mountain top.
   只有通过单线线路才能到达山顶。
2. 2. The engineer used a single-wire line to connect the two substations.
   工程师使用单线线路连接两个变电站。
3. 3.The single-wire line was the only thing that could transmit power across the vast distance.
   单线线路是唯一能够跨越广阔距离传输电力的东西。