郊区线路（suburban line）：设在城市市区与郊区，郊区与郊区间的公共交通线路。
就拿上周发生撞车事件的郊区线路来说，驾驶员们就在抱怨，说安全系统并没有完全处于正常运转状态。
As with the suburban line on which last week's crash occurred, drivers complain that safety systems are not fully operational.
一般来说，乡村和郊区与市区相比，其网络线路铺设距离大，天气环境状况差，从而其网络维护成本更加昂贵。
Rural and suburban installations typically involve longer distances and tougher weather conditions than urban ones, making upkeep of the network more expensive.
本周三早上，连接西南郊区和中心市区的燕房线——北京第一条无人驾驶地铁线路——开始第一次试运行。
The Yanfang line, Beijing's first driverless subway line connecting the city's southwest suburbs to its central urban district started its first pilot run on Wednesday morning.
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