single overhead contact line

例句：

1. 1. The engineer designed asingle overhead contact line for the new powerstation.
   工程师为新电站设计了一条单线架空线路。
2. 2. The construction crew installed thesingle overhead contact line during the night shift.
   施工队在夜班期间安装了单线架空线路。
3. 3. The single overhead contact linewas used to transmit signals between the twotowers.
   单线架空线路被用来在两座塔之间传输信号。