名词
中文翻译：封闭的管道
同义词：
['closed conduit', 'sealed duct例句：1. The engineer designed a closed duct to improve the efficiency of the heating system.（工程师设计了一个封闭的管道来提高供暖系统的效率。）']
例句：
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1. The engineer designed a closed duct to improve the efficiency of the heating system.
工程师设计了一个封闭的管道来提高供暖系统的效率。
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2. The closed duct was used to carry waste gases from the factory.
这个封闭的管道用来输送工厂的废气。
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3. The closed duct is essential for maintaining proper airflow in the building.
这个封闭的管道对于保持建筑物内的空气流通至关重要。