pipes

例句：

1. 1. The pipes are old and worn out.
   这些管子旧了，磨损了。
2. 2. He used to smoke a pipe in his study.
   他过去在书房里抽过烟斗。
3. 3. The plumber replaced the broken pipe with a new one.
   水管工用一根新的管子替换了损坏的管子。