duct spacer

例句：

1. 1.The engineer used a duct spacer to seal the leaky pipe.
   工程师使用一个导管填料来密封泄漏的管道。
2. 2.The duct spacer is designed to reduce noise and improve airflow.
   导管填料的设计旨在减少噪音和改善空气流通。
3. 3.The duct spacer was installed in the factory to prevent dust from entering the production area.
   在工厂安装导管填料以防止灰尘进入生产区域。