Jack notices a mounted camera in the facility with its wires threading into a narrow conduit that runs along the ceiling. 杰克注意到在拘留中心内有安装摄像头，摄像头的电线穿过一排窄的线管，沿着天花板延伸下去。
An idea forms in his mind as he follows the conduit to an observation room with monitors watching every area under the ground. 他心里涌出了一个念头，他顺着线管来到一个观测室，里面的监控器监测着拘留中心的每一个地区。
It's a conduit enclosing insulated electric wires. 这是包电线的导管。
An examination is carried out before the insertion of the tube. 插入导管前先要进行检查。
