链

例句：

1. 1. The police found a chain of clues leading to the murderer's hideout.
   警方发现了一串线索，指向凶手的藏身之处。
2. 2. The train was linked to several other routes by chains of tracks.
   火车通过一系列轨道与几个其他路线相连。
3. 3. The scientist used a chain reaction to power his lab.
   科学家利用链式反应为他的研究实验室提供动力。