Jack notices a mounted camera in the facility with its wires threading into a narrow conduit that runs along the ceiling. 傑克注意到在拘留中心內有安裝攝像頭，攝像頭的電線穿過一排窄的線管，沿著天花板延伸下去。
An idea forms in his mind as he follows the conduit to an observation room with monitors watching every area under the ground. 他心裡湧出了一個念頭，他順著線管來到一個觀測室，裡面的監控器監測著拘留中心的每一個地區。
It's a conduit enclosing insulated electric wires. 這是包電線的導管。
An examination is carried out before the insertion of the tube. 插入導管前先要進行檢查。
