narrow-bore tube

例句：

1. 1. This narrow-bore tube is used to carry gases through small spaces.
   这个窄管用来通过小空间输送气体。
2. 2. The engineer carefully installed the narrow-bore tube in the wall.
   工程师小心地将窄管安装在墙上。
3. 3. The narrow-bore tube was essential for the operation of the machine.
   窄管对于机器的操作至关重要。