车链子

例句：

1. 1. The bicycle chain is the most important part of the bike.
   自行车链条是自行车最重要的部分。
2. 2. The mechanic checked the chain and found a small crack in it.
   机械师检查了链条，发现它有一个小裂缝。
3. 3. The new chain was much smoother than the old one.
   新的链条比旧的光滑多了。