hand-in-hand chain

例句：

1. 1. The police were able to trace the thief's location by using a metal chain.
   警方通过使用金属链条追踪到了小偷的位置。
2. 2. The train was linked to the city's subway system by a long chain of tracks.
   火车通过一系列轨道与城市的地铁系统相连。
3. 3. The scientist used a chain reaction to power his lab equipment.
   科学家利用链式反应来为他的设备供电。