chain dog

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，指向了凶手的藏身之处。
2. 2. The old man used his chain to pull himself up from the ground.
   老人用他的链子把自己从地上拉起来。
3. 3. The train was linked to several other cities by a chain of railway lines.
   火车通过一系列铁路线与几个其他城市相连。