小管

例句：

1. 1. The small tube is used to transport gases.
   这个小管子用来输送气体。
2. 2. The engineer carefully inspected the small tube for any leaks.
   工程师仔细检查了那个小管子，看是否有泄漏。
3. 3. The small tube was connected to the main line.
   那个小管子连接到主管道上。