idle line

例句：

1. 1. The idle line is a popular spot for people to relax and enjoy the scenery.
   这个闲置的线路是人们放松和欣赏风景的热门地点。
2. 2.The idle line was used to connect two buildings during the construction phase.
   闲置的线路在建设阶段被用来连接两座建筑。
3. 3. The idle line was removed after the construction was completed.
   施工完成后，闲置的线路被移除了。