AND tube

例句：

1. 1. The engineer used a pipe to connect the two systems.
   工程师用一根管子将两个系统连接起来。
2. 2.The pipes were old and rusted, making them difficult to work with.
   这些管子旧且生锈，很难使用。
3. 3. The scientist discovered that the tubes were filled with water, not gas.
   科学家发现那些管子里装的是水，不是气体。