dry return pipe

例句：

1. 1. The engineer used a dry return pipe to connect the two pipes.
   工程师使用一根干燥的回气管将两根管子连接起来。
2. 2. During the construction, the dry return pipe was crucial for maintaining airflow.
   在施工过程中，干燥回气管对于保持空气流通至关重要。
3. 3. The dry return pipe helped reduce the risk of leaks during the installation process.
   干燥回气管有助于降低安装过程中泄漏的风险。